I recently put a 95 LT-1 in a 61 Chevy wagon. It was quite a challenge but worth the effort. I got a lot of information from Street & Performance in Mena Arkansas. They can build you a harness to match your needs. Their number is (501) 394-5711. They are nice people and very knowledgable. Their specialty is TPI. Their web site is www.hotrodlane.cc
Your probably in for some surprises...like the guys before said, remember fuel return line back to the tank and high pressure fuel pump (in-line or in-tank). You may even need a new fuse block for the additional electronics. Good luck with your project.