i have used high pressure pumps before they were once avail from ford and trw.
if you are racing with factory rod diameters this was a bandaid to keep the motor alive in high rpms. to use the high pressure pump you also used .001 undersize rod bearings for a place for the
oil to go, thus your rods ran on a thin layer of
oil. so when using steel cranks (factory) this is a good idea to keep from spinning a bearing, usually #7 is the first to fail. if you have an aftermarket crank with sbc rod journals the high pressure pump is unnecessary and the high volume is fine. when racing these engines if we did not have at least 80psi at idle we had problems, it was usual to have 100 or more psi at higher rpms. if you are street driving a factory crank keeping under 6000 rpm i wouldn't stress over the high pressure pump.