Hi volume oil pump vs standard volume pump

in a 1/4 mile a H.V. pump will not suck a 5 quart pan dry . but in a mile I have been there, zero pressure on the gauge-my friends 327 with 4.88 gears on a street blast. Smokey tested pickups-the screen type is much better-90% open, 10% metal. the bunch of drilled round holes is 50% open