Seem's to me the point is about the flow produced on the afternmarket iron heads was comperable to the aluminum... I don't see it as a pissing match between setup, just that the heads were made to flow enough to support that amount of power...
Assuming those heads were on a 540" @ 5500 rpm maybe they'd make as much power as another 540 with AFR's????
When detonation becomes an issue I can see the advantage of going to aluminum but if you're just trying to make 50-75 more HP over what you have it might make sense to go with a cam and porting the heads you have?
Let's not be defensive, it's an open forum.