Stock oil pan and HV oil pump?

Oil flow through the engine is controlled by the bearing clearances, oil pressure and viscosity. The high volume pump cannot pump more oil through the engine than the standard pump unless you change one of those factors. A standard pump will pump more oil than a high volume pump if you run higher pressure than the high volume pump, until the engine really begins to wear out. The advantage of the high volume pump is that it can make up the necessary volume if the oil gets hot or the clearances begin to increase. I run a high volume pump in everything we build unless it is completely stock with tight stock clearances. You can lose a little horsepower with the high volume pump because of the oil pressure back against the greater surface area of the high volume pump rotors.