More exhaust manifolds

Not sure how this will work but here is a link. Show's the interchange for the manifolds and the 72-73 DS 340 manifold interchanges with the 74 DS 360 manifold.

The fact that the casting number is the same is enough for me. I could see the same casting number on different parts if they were machined different after they were cast (e.g. 340 TA heads where J castings with special machining for pushrod holes), but there isn't any machining related to the outlet. So, if the casting number match and it has a flat flange, it is an HP manifold.

Might be worth changing the terminology to "flat flange" rather than "340". The 360 in '74 Dusters and Dart Sports had a flat flange HP manifold on the driver side.