340 manifolds in a 66 cuda?

Hey Dana, Going to put a 904 behind the 340 with a revised floor shifter in this 65 Dart. Another member helped me with the cable shift to mechanical linkage on that problem, but one thing leads to the next...I guess. Any further help on this manifold issue will be great. Just looked up what a z bar is, appears it deals with a manual transmission...correct? Always had autos...learned something today. Thanks. Jerry