I own a set of Edelbrocks ported by Kauffman. I also owned a set of RAIV 722's and RAII 96's.Edelbrocks ARE NOT round ports as a RA II or IV. They are square with a convex roof.

http://i3.ebayimg.com/08/i/000/cc/e3/9f5e_1.JPG

Here is a "true" example of a round port head..exhaust ports are the SAME as a RAIV, chamber size is different as well as the spring pad depth.

http://i11.ebayimg.com/02/i/000/ce/7d/30ef_12.JPG

The exhaust ports with the RA II AND IV are different than the Edelbrocks. Edelbrocks also used 1.66 exhaust valves in their RPM head.