An Old Timer once told me...
Mullin, how does it run over say, 4500RPM?
What are the cam specs on the .474?? I never have ran Mopar cams. A quick google search and all I found was the .280 adv dur....
As someone who has ported tons of 302 heads, I'm not going to say the numbers are a fib, but back cutting the valves usually is a couple/few CFM, right? Wild may know more, he has a bench.