We will see what the race TP heads I have will do with a more radical combination.
I think a lot of guys are getting the street heads confused with the race heads. They are completely different, even the valve sizes and combustion chamber designs are 180 from each other. These are the street heads, with little 1.950"/1.500" valves.
The heads like rpm, that's a given. But I think the story is that the bottom ends wouldn't hold the kind of rpm that was necessary to get the most out of the heads. Who knows.
The heads measured about 185cc in the intake port volume. I think if you were to jam a 185cc AFR head down on a 302 you would probably get a little soggy bottom end too.