All modern American Cars and cars imported into the U.S. have the key to the right of the steering column. This seems to go back at least until the early 60s with one exception that I know of.
Ford trucks and vans had a dashboard ignition on the left until the early to mid-70s. The Mustang always had it to the right from 1965 up.
Why did they put the key on the left in the trucks and vans? Was it only cars with manual choke that had the key on the left?