Can I put a 340 out of a 72 Duster into a 68 Dart? The exhaust manifolds have different casting numbers, but are they the same part? Do I need to buy 68 340 manifolds? Thanks.
Just buy an exhaust system designed for the 72' Manifolds, and it will work. Accurate exhaust makes the system based on the Manifold casting number. It will fit the 68' body.