just replace it with a stock over the counter oil pump from napa.

I have used a lot of the melling M72 pumps on new engine builds as well as high milage engines.

if I use a HV/HP pump on a new build I drill the oil pump/main cap/block to 1/2" add 4 more holes in the oil filter adaptor, drill the feeds to lifter galleys to 9/32,matching/blending all mating surfaces and rounding any turns i can reach.

other wize it uses a stock pump with stock engine specs.