More exhaust manifolds
Interesting. So they pulled the manifold in towards the head when they added the heat stove. Wasn't aware of that. I thought the only difference was the flange for the stove.
You are aware that the '74 360 Duster used the same manifold on the driver's side as the '72 and '73 340 right? You keep saying "340 manifold", just making sure I understand what you mean.
Here is a link to a set of manifolds off a Dart Sport with a casting date of 1-15-74 and the same casting number as the '72 and '73 340 manifold. He claimed it had a 2 1/4" outlet, but no picture. I only offer it as proof they were still casting the same manifold as late as '74.