Oil pump.... reuse or buy new?

I called Mellings when I did my how to change a pressure relief spring and they told me that they use the 72 psi spring in all of their Mopar oil pumps...

Mopar Performance uses a 55 psi spring on the standard pumps and you have to use the spring kit to get it to 75 psi...

Shoot I have a Melling pump I got new and it never made more than 60 psi or so, pretty rock-solid but definitely never anywhere near 72-75 psi. Maybe I got an MP one off Mancini? It was 9 years ago I can't remember lol, I do remember it was a standard one though not HV or HP.