Exhaust manifold casting #'s needed

Just joined this forum -- it looks great!

Maybe someone could help me. I'm purchasing a TTI 2.5" exhaust system (from the stock exhaust manifolds) for my 1973 Dodge Dart Sport 340 (automatic tranny), and I need to supply TTI with the exhaust manifold casting numbers when purchasing their system. I guess I can check the casting numbers on my manifolds, but in the meantime, can someone here verify these numbers from their resource materials?

Also, anyone here install the TTI system on '73 340 A-body? I'd be curious to know your opinion of it.

Thanks!