The passenger side is not the same. The A-Body big block manifold is longer and it makes the exhaust pipe connection MUCH easier. The B-Body works find, just need a custom pipe. The driver side is harder. I have seen both B-Body HP used with some grinding, and C-Body used with a pipe that is not very desirable but will work. You usually have to use a smaller pipe with a hard bend that is not ideal. I have one of the C-Body manifolds that AAR welded a pipe too and it is a great piece, but I don't believe they make them anymore