I put a 66 body on a 74 frame, frame is same as 76. I ended up changing my rear door posts so i could use my 74 doors. The only real issue was the wiring. I had to drill a few large holes in the firewall to fit the wiring through as 66 had different wiring and in different locations, also had to plug a few of the holes used on the 66, not a big deal. Overall, it was pretty much a bolt on. Power steering box should still fit.