I put a 4.3 into my Jeep Wrangler, that was a 15K project in itself, and those are common swaps. You will need the computer and all wiring, mounts, transmission, an axle that can handle everything,suspension, etc. i have seen 280Z cars with 350 chevys, so it is possible. Question is do youhave/want to dump that much money into a vehicle that youmore than likely will not see anything near what you put into returned. This will be a project just for you, you may never be able to unload it, it has taken me 6 months to sell my Jeep.
sig pic courtesy of GBALT05