318 running with low power - dyno

I am not in the know on the action plus intake. Is it the same as the performer, or are the runners enlarged to 360 size? Reason I ask is for one I am planning on using the same intake, but on magnum heads. If the original heads have the smaller intake ports that would make for a restriction between the intake and the heads. I may be wrong, but I would think that would be somewhat of a factor.

Also, would a thermoquad work better for his setup?