Exhaust manifolds and Holly carbs

My comment is relevant so hopefully it will not be deleted. Why do you want to trade the C body HP manifold? It will work on a 67 and U A body if that's what you are after. Some of them require angle milling a little to make the outlet closer to the engine, but then sometimes they fall right in......with the low deck only, I believe. I am not sure about the RB.