I recently removed my 429 motor from a 1970 ford torino gt for rebuild. I noticed that one exhaust manifold is a C9VE 9431 A. However upon inspection of the second manifold, I found the part number to be D4VE 9430 A1B. First, should I replace the D4VE manifold with a C9VE one? or is the D4VE an exact match that I can use on the motor? Also, with 2 different manifolds, will the alignment be correct for the exhaust? Thanks you......