As far back as I can remember all the Melling M54 pumps were 60psi. They used to supply them with a lighter spring if you wanted to install it. Not sure what they are selling or supplying now.
The pick-up tube needs drilled/tapped for a machine screw to keep it from falling out. At some point they went to "softer" material for the pick-ups and they will fall out if you don't take extra steps to keep them in place......
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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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