Why would low lift head flow hurt power?

I think its time to move on from this discussion.......

How much power do Nascar engines make with just a 390 cfm carb.........
An embarrassingly inferior amount compared to running unrestricted, not to mention an ill-mannered time bomb that had to be subdued by NAPCAR to prevent routine explosions oiling down the track, and leaves the drivers helplessly hanging on praying the suspension & aero won't get them killed....and looking for friends that won't send them 20 fooking spots back in 1/2 a lap. That cover it for You?