Ford SOHC and BOSS

Suppose I wanted to make a hot rod, starting with a 427 big block.

Are there aftermarket 427 SOHC and 429 BOSS heads and hardware available to recreate the legendary monster mills of yesteryear?

There are lots of place still making parts for both motors. Ford SVO parts from your local Ford dealer would be a could place to start. The 429 is still available from Ford as a crate motor. Jack Roush will sell you a 427 built to your specs. Google 427 Ford or 429 Ford and you will get plenty of other sites willing to sell you every up to complete engines. If I was going to put a big block Ford in something, I think I would go for one of these 514 cubic inch monsters. Nothing says power like cubic inches and the more, the better.