Man that's a good question and i'll bet the answers will come in all kinds of different opinions. i personally run high volume pumps but i also run .0025/.003 clearance rods and mains. I use the stabndard spring (42 lbs) with 20/50 oil. It will maintain 40/50 lbs at rpm, but idles around 20/25 lbs. hot. I haven't run one yet but i like the B/BLK pump with the 3/4" pickup. The problem with high pressure is that it robs a lot of HP, causes cam distortion, wears distributor gears, and causes irratic distributor timing. If i could i'd have 25 lbs. pressure crossing the finish line or go dry sump. I do run a front distributor drive on the blower motor.
Like i said varied opinions for sure.
Zip.