Late 340 exh. manifold research

John Bedore said
I have a 34118623 dated 4-16-71 but has a ball for mounting and my left side 2863553 has flat flange is that going to work when I order my exhaust from Accurate exhaust by the way they ask you what castings you are using .

That's a 71-73 A, B, and E body 340 and C body with a 360. I think you can mis-match manifolds and Accurate can get you the correct head pipe.