dartjack,
This is what SuperFlow gives as a HP equation, air flow @ 28" divided by 1.67 to get to flow @ 10" and then X by 3.44 for HP. So this is what I would do, add all the flow's up to the valve lift by .100 then divide by the amount of lift then use the equation above, or it would look like this.
76+111+175+201=563 divided by 4 =140.75 then divide this by 1.67= 84.28 X 3.44=289.92 HP