oil pump question

I like to run the hv pumps with high pressure springs.

You need to bang the oil pan a bit to fit the taller hv pumps.

Not much, but about 10-15 minutes worth. Lay the pan on the block surface without a gasket, then keep banging it until the pan will sit flush on the block surface without any interference. Focus on banging on the front edge and the front radius along with the area just behind it on the bottom surface until you can get the holes to line up and the pan to sit flush. Then when you assemble it with the gasket, it will be fine...

The Mopar oil pumps come with a 55-65 psi spring, and you can order the high pressure spring to get it up to 75 psi if you wish.

Or all Mellings pumps have a 72 psi spring. They don't make a lower pressure spring for theirs, if you get a mellings HV pump, it will have the higher pressure spring (close enough by 3 psi).

If you need to know how to change the spring, go here:

http://www.forabodiesonly.com/mopar/showthread.php?t=301617