Even on the highest output full race engines I've done we've used the stock Melling pump with 60psi spring. Never a single issue with these engines even spinning them past 7000rpms.
The key to success is in the short block preparation and parts used. Good rods that don't go out of round at high RPM's/heavy load and crank and block work that are spot on for fit and finish.
We do the same with our SBC engines, even the high RPM circle track ones we've done for local racers. A stock 40lb standard volume pump is all that we use here, extra volume and pressure just rob power and wear out the distributor gear quicker. Plus you put extra stress on the pump drive (I've seen a few shear off) and timing set.......FWIW.....Cliff
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https://cliffshighperformance.com/
73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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