Thanks for chiming in. I have 1/2 point less compression than that and about .035" less lift but those two factors alone can't account for that much difference. Or maybe it could? I don't know. I do think the intake was a bottle neck though how much is obviously the point here.
Did you weld or epoxy the ports to get them lined up? I'm probably not going to get that involved in it. For $457 it should be a dead-nuts match. But we all know how that goes.
There was a thread several years ago by MRL Performance where he flowed a bunch of small block intakes. It listed a 'gasket matched' M1 that flowed 288 cfm. If we're all in agreement that the M1 was basically a copy of the Strip Dominator then it seems reasonable to presume my intake is close to that figure and currently seems like a decent match for the heads. Maybe a little more whittling and a spacer really would do the trick.
What is the consensus regarding the spread bore flange though? When running a 4150 base throttle body on a spread bore opening does it hinder anything? Would merely bolting some sort of spacer on it eliminate any mismatch issues?