another trans question

[bad6772]

got a few more quick ones....a buddy of mine at work has an 82 chevrolet silverado.lwb...that he is stripping down..it is all stock and never been touched...other than the engine....its a 355 with the factory 4 speed..(it is a NO granny 4 speed.( i also measured his trans at 21 inches mine now is about 17)...any ways i have been having lots of trouble. with finding the correct 3 speed for my 67...its a 250 3speed on the floor.... i know there have been some trans threads but i didnt know if the later model stuff will work(i know it will bolt up but?... i am thinking of running the 82 four speed trans,shifter..everything from it...behind my 250... can i use his drive shaft? if not thats ok....(i can have it sent out to be cut down)...also do i have to run a trans crossmember? basically i can have anything i want of the truck..... but i am buying the engine and trans really cheap....any help would be awsome............thanks tony......