454 back to original 350 swap info

[Sandtrap9072]

So my 1972 gmc jimmy has a 454 in it, and I've been slowly but surely restoring the truck back to original. I would like to put the 350sbc/350 turbo back into it. But how am I supposed to know what parts I have and don't have. Is there any good info you guys or girls can give me? I have a guy who has an engine and trans from a 72 as a good start but, from there where do I go? Finding things like brakets, hoses etc.any help would be greatly appreciated.