Which air gap manifold?

Eracer, you are worng, theres 2 styles of RPM intake for the Mopar small block. They are;

Air gap and regular RPM that has a heat crossover.

The Big block engines naturaly have a air gap style intake from the factory.

Tim, if your car is more street driven in a normal driving manor AND it see's cooler to cold temps, the the regular RPM air gap that is heated may be better for you as so to increase drivability. And quicker drivabilty as well.

Ethier intake is more in line with the cam you have though the Performer isn't a poor choice, the RPM will be much better for the larger displacement engine and current set up you have listed.