He must not know anything about the early AFB air flow ratings, those stock small bolt pattern AFB barely flowed 400 CFM originally each.
I wish he had stated the actual carb #s instead of ASSUMING that they were 625 CFM Carter AFB
I've owned and race several cars with stock dual quad sets up like that one years ago
We never made the fuel systems good enough to feed the motors more fuel than they needed, they always show the plugs being dead lean at WOT
WE didn't know what we hadn't learn yet