I would blueprint it and tighten it up. You would have to do that with any new one. IIRC Melling HV FORD are only about 20 - 25% more volume. Stock should be fine. Used stock pumps up to well over 400hp on the FE. HV pumps eats HP. pumping oil is not free and shearing it in bypass is not good at all.I didn't do anything to any oil passages to valvetrain.
Everyone is correct, the small mods I did only opened up oil passages to the bearings. So shouldn't have any effects on oil pressure. I'm tempted to remove the pump and inspect it. They are cheap, and I may just put another in.
Have fun.
p.s: that motor doesn't want a 50 in it. I would run a ho hum 10W30 HD mixed fleet dino for break in with a break-in additive. for the first couple oil dumps. Rotella Triple was a go to oil. I cant find it anymore. I hear Tractor Supply carries it.