I have an 83 4x4 that I put a 383 in and used the rear sump pan, the center dump manifolds and 4x4 mounts. Everything fits and works good. I did not have to change anything on the booster and I have column shift. I have a set of big block 2 wheel drive motor mounts, I thought they would work so is there a reason why they wouldnt work in a 4x4? Also on the lean burn you dont need a different harness, just eliminate all the lean burn stuff and ad a wire to the relay on the drivers side inner fender for the ignition. Took me 2 days looking at the manual and while eating a bowl of cereal looking at the manual I figured it out. I will go out in a few and snap a pic. Greg