You'll need to find the bell housing for a '63 + truck with the Muncie 4 speed tranny as they used that up to'68 that I know of...
Engine Mounts will need to be fabricated too .
it's far easier to hunt the Task Force boards and find a good 235 takeout from a hot rodder , these are alwaay very cheap , even fully rebuilt 235's don't go over $500.00.....
Good used ones only cost $150.00 + / - , fan to clutch , check the older ads as these engines will still be sitting there in three years if not scrapped.
Good luck hunting ! .