Pro comp SB aluminum heads ebay combos

Has anyone seen flow numbers in unported form? You'd think they would be similar to Eddies, but who knows for sure. If they are similar, I'd think about having a reliable builder make a set for less than or same $ as Eddies and not have the worry about poor assembly with OOTB Eddies.
Don't these also provide the advantage of using the factory shaft rockers?
Am I off base here?