I finally got my newly rebuilt engine into my 86 K5. Got rid of the guttless 305 and swapped w/ a 355. I had SO many problems swapping a 1978 engine in the place of the 1986 application. Had to put headers, dual exhaust, etc... I found out that using the original (newer HEI distributer) is a BAD thing...Now looking for an older system to avoid computer crap. I am also needing to change the carb set up. Does anyone have a recommendation for a carb/intake combo to put on it? Would an old, pre 1974 HEI system be easy enough? Has any one put headers in place of the stock manifold, with A/C??? What did you do with the A/C bracket that use to hook to the manifold? Any inyput would be awesome.