I have a 77 with JTR conversion. That conversion sets the motor back to the fire wall and toward the passenger side about 3/4 of an inch. It went much better than I had expected. They also have a book that goes through the whole ordeal that you can buy. It has some pretty good specs. on the parts you can build if you don't feel like buying theirs. I would recomend buying the parts unless you have a machine shop available to you. Send me an email if you want more info. I'd be glad to help. I used a 350TPI. If I did it all over again....I'd probably go LS1, but the tune port is what I had in the corner of the garage. It still is piles of fun.