Headers to Rams?...

[MAC71Cheyenne]

I have been reading through lots of the past posts on exhaust questions and options, as it is getting tiresome accessing plugs and worrying about expensive plug wires being torched. There are many thoughts, options, and opinions on this subject...simple? Yes and no.
What I am working with is a '71 C10 twd 350/4 bbl with Edelbrock carb and intake. No idea if any internal modifications have been made. Current set up is unknown headers into a 2.5 inch Flowmaster dual setup. I would like to go back, to the future with keeping the pipes but using GM cast rams horn manifolds. Alt and AC are on brackets mounted to the block. The number of different manifold configurations is part of the question as it would've nice to have the heat tube business up and running also. Gets kinda cold around here. No a.i.r system.

So all that said...manifolds for dummies. Thoughts on specific castings or just in general?