If you are not building a concourse de elegance quality build, you would be money ahead by building full pressure 235.
A '53 235 With Powerglide Engine (that is what they call the engine, you don't want the Powerglide transmission). or, a '54 235 from a truck or a car would be a direct bolt-in.
Any 235 '55 or newer will require some modifications to make it work. Nothing too difficult though.
It is hard to find anyone capable of rebuilding a 216. If you find one who can, it will be considerably more expensive to have rebuilt.
I hate saying this, because 216s in old trucks is too cool.
Carl
