Manifold question

In your case i'd use the Performer. As far as the cam, the high energy 260 is ok, but i'd look at the Summit 6900 at about half the price. Use whatever carb you have in the best shape. The AFB's may require a plate to seal well with the Perf.

P.S. I always try to remind people that if you're going from a 2 to 4bbl, make sure you get the trans linkage close to spot on.