The edelbrock have the offset rocker if I am not mistaken, which means they can ultimately flow more air. Typically the difference between the Indy small port and the big port with offset intake rockers is about 20 to 25 cfm. The bigger port window will make another 50 to 60 hp in a maxed out combo, but it requires an aggressive cam and more rpm to do it. I don't know how the big Edelbrocks stack up, but should be close to the 440-1 for power.