I'm getting ready to install the OEM exhaust system in my 70 Challenger and have a question about the connection between the exhaust manifolds and the head pipes.

Should the ball flange have a gasket on the inside diameter of the exhaust manifolds?

I bought the manifolds as a used repo set and they have a round composite ring type gasket stuffed in both exhaust manifold outlets. Should I be using them?

Its been so long that I'm missing one. But maybe I don't need them?