My old 400 block pump gas stroker motor made the most power with a set of 440-1 CNC ported by Jeff at MCH
I tested two different motors with those heads and a set of Indy SR M.W. intake ports, the SR flowed 30 CFM less than the -1 did and the -1 heads made over 50 HP more than the SR heads did on the pump gas motor they made 65 more HP on the race gas motor Same short blocks, cams, intake and carb with no jetting or timing testing on either motor
Go big for big power