I have the HV Precision
Oil Pump in my small block. The pressure is adjustable by removing the
oil pickup and turning the spring stop. Precision
Oil Pumps sets them up to run approximately 85 to 90 psi hot @ 1000RPM, standard clearances and 10w30 Mobil 1 on my engine. If you don't want to run that much pressure, simply turn it down. One revolution of the spring stop CCW, is about a 8 or 9 PSI reduction. The Teflon inner coating on the gearotor and housing is a nice touch and makes the rotor feel like it runs in butter. IMO, well worth the money.
On a related note, I was using a Canton rear sump road race pan with all the trap doors, baffles, etc, designed for a Mustang. Under high speed braking, I was loosing oil pressure, to the point that I could hear the lifters tick. The only thing I can think of was the oil was moving to the front of the pan, and when the pump sucked the baffled area dry, it started pulling air, because the G force was keeping the oil in the front of the sump. I recently bought an Armando's front sump pan in an effort to cure this. Hope to have it installed soon and tested. This wasn't a problem until I installed the Wilwood 6/4 piston brakes.