OK, now you're making more sense. This is mainly a truck forum, so we're not used to dealing with car questions. The automatic you've got is a cast iron case Powerglide, which won't bolt up to the later model engine. If you want to swap to the newer engine, you'll probably need to use a Turbo 350 transmission or one of the later-style overdrive automatics like a 700R4, etc. You'll need to fabricate engine/transmission mounts, and deal with things such as the enclosed driveline, rear end, etc. You'd be better off finding an insert-bearing 235 engine and installing it with the original transmission. There would be a lot less fitting and adapting involved with that swap! A Powerglide from a 55-61 V8 engine would bolt up to the late-model 6-cylinder, but it still won't solve the driveshaft adapting probl;em. Your car has an enclosed driveline, and the mid-50's transmission is made for an open driveshaft.
Jerry
