In theory but in practice I don't believe there's a power difference between the two but yes seems you can squeeze a bit more cr from aluminum heads and run on pump gas probably less chance of hot spots.
I don't know about 25 cfm more, Charles Servedio flowed both and are fairly close to each other on intake side, J had slightly more peak flow and magnum had slightly more low flow, exhaust magnum did a lot better, probably that and more do to port and chamber shape for hp gain.