Thank you Lamar - I’m baaaaaackkkk! 
Actually, my particular Mustang is the famous 1966 Shelby GT350 Fastback - however, being the perfectionsit old tart that I am - since the car arrived I’ve been doing truckloads and truckloads of online research into finding our every thing you could possibly want to know about classic Mustangs (and I guess this applies for most American muscle cars of the era).
OK, first things first… here are my favourite websites for buying everything (and I mean absolutely EVERYTHING) you could possibly wish to buy for a classic Mustang.
(1) www.californiamustang.com
(2) www.totalcontrolproducts.com
(3) www.sandersonsales.com
Now the first one is an online store which sells every single knob, dash bezel, lever, rubber weatherstrip, chrome, headliner, carpet, seat foam, door panel, you name it - they sell it all - brand new… including every body panel imaginable.
The 2nd website features the most technologically state of the art suspension and steering systems which money can buy. Effectively, you can turn your 38 year olf Mustang into a modern Porsche, handling wise - and believe me - old Mustangs were pretty crude - even the Shelby’s. But more about that in a minute.
The 3rd website is merely a reference website which links you to the sales point for the new Shelby GT500E (the E is named after Eleanor in the film “Gone in 60 Seconds”) It’s an interesting website because Caroll Shelby is involved and they take 67 and 68 Fastbacks and strip 'em to total raw metal shell and then build the cars brand new from scratch with totally brand new componetry - including the TPC chassis and suspension products mentioned above. It’s a very interesting website. Yes, that’s right, for just 80-120K in US dollars you can buy a perfect Eleanor just like in the movie - and it’s a totally wicked car believe me. (But I personally prefer the shape and weight of my 1966 fastback myself).
Now… getting back to your convertible? OK, be aware… they twist… they twist dreadfully actually. And further, as they get older more and more tiny stress cracks manifest themselves in key points under the car around the chassis suspension arms and places like that. I would STRONGLY recommend spending the $300 on TPC’s convertible underbody roll cage chassis stiffener. Believe me when I say this, it will prolong the life of your car’s shell by 20 years or more. It’s a 2" specially designed tubular chassis stiffener which is welded onto the underneath of your floor plan. It reduces chassis flex by orders of magnitude - and on a convertible - man it’s totally paramount.
Next… look, I don’t know how to discretely say this without offending my dear American friends but… ummmm… the steering and suspension systems used on 60’s Mustangs was ummm… pretty fucking crude folks! I mean sorry… I can’t lie about this, but it was, you know? The control arms and shock towers all were made out of pretty thin stamped metal and the mounting points used rubber bushings. As the years go by it’s a suspension system which becomes incredibly fatigued with stress cracks and metal deflection and sloppiness and creakiness.
It’s just a fact of life, if you’re going to own a classic Mustang you simply have to accept that you’re going to need to replace the suspension bits and pieces.
Now there are 3 levels you can go about this…
Level One - bare minimum - about $2,500
Level Two - intermediate - about $4,500
Level Three - total effort - about $12000
On Level One you replace all original parts with total replicas but new - excluding the rubber bushings. You should replace those with polyurethane.
On Level Two you replace all original parts with modern technology versions of the originals including modern shocks and new steering components.
On Level Three you go the whole hog. Total fit out with 13" disk rotors and 17" wheels, modern Power Steering rack and pinion, titanium tubular coil over shock suspension and chassis stiffening and the coil over shock rear suspension system. You’re getting close to GT500E technology by this stage.
Anyways, my point is this… it’s an old car, OK? THey’re as famous and as sexy as any car in history but don’t let anyone tell you that they somehow stay immacualte all by themselves. Nothing could be further from the truth. They have lots of parts which get old and they bend and they get corroded and they get very, very sloppy. A 1968 convertible Mustang also has something else going against it… the steering used an exceedigly crude worm ball steering system with Pitman arms… very complex and very prone to getting totally vague and sloppy.
All of these things need to be considered. I’m lucky, my GT350 is the classic of classic - Scarlett Red with twin white Le Mans stripes with matching colour coded interior - so it’s worth doing the work on. My goal is to have a magnifecent classic car with the best of modern technology and that’s because I don’t give a shit about keeping it original - I want the fucker to handle like a go-kart, and you can achieve that, but you need to be aware of the effort and the costs.
The rule of thumb is this - unless someone can show you at least $15,000 of receipts in the last 3 years on a classic Mustang, you can safely assume you’ll need to spend that money yourself. The simple truth is that they’re an old car which suffers from metal fatigue. And convertibles are the most prone of the lot.
