I agree to a point about peak head flow being the limit that`s why I go bigger in lift and duration that way I pass the peak on opening and closing and believe P-body does the same thing iirc.......
I try to.. if the head peaks at .600 and you run .700 lift it sees that .600 twice with the time in between.. if you go .600 it sees it once and for only a short period of time... specially on a limited head you need more time to get the A/F in there at the upper RPM when things are happening fast
