I have gotten into my replacement '77 2F engine. (going into a '76) Noticed there was a gap in the intake manifold gasket. So I took off the entire manifold and now have to decide can I get the intake separated from the exhaust manifold to replace the gasket(it is where the heater return, I think) or do I just go with headers since I have to separate anyway. If headers then which 6-1 or true duel? And which brand? Advice please