If your engine is fairly internally stock and dosn't see high RPM's for an extensive amount of time, then dont bother with a High Volume Pump.... Stick With a Standard Volume, they flow enough and still provide good oil pressure. In most cases a HV oil pump is not needed... they rob Horsepower, raise the oil tempurature, and can at times suck the oil pan dry if a stock pan is used. Unless your car is a full out drag car, road race car, etc. etc. then forget about a HV Pump, it is not needed.
Shon