Velocity is somewhat as important as flow. Thats why lets say the gt-40p has smaller exhaust valves than the gt40 but has better power numbers: the extra velocity. If you get huge ports and your engine isnt some overbored stroker, you'll probably have terrible low end- midrange throttle response. Up top, it'll be great but down low, it will suffer.
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91 GT Carb conversion, holley 600 double pumper, edelbrock performer intake, FMS "C" drop springs, march 1000 underdrive pullies, crane 1.7 roller rockers, GT-40P headers, bassani x pipe, american thunder catback, FMS 4.56's, msd aL6, trunkmount battery, A/C eliminator kit, 3000 stall tci streetfighter, AOD with transgo kit, A+ servo, 300M hardened lockup shaft, kevlar bands and 28,000 gvw trans cooler, 3 core radiator, 300 lbs stripped with a full interior
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