low oil pressure rebuilt 318

hello everyone, i rebuilt a 318 la back in may , all new bearings and rings, cam, etc, it never gets past 25psi at 4k-5krpms, less than 10 at idle , its got a brand new oil pick up, ive changed the pump 3 times, the 3rd one i put a mopar performance spring in it, i run valvoline vr1 20-50

its always read 50psi with a drill when priming and im assuming 700 rpms with restistance when pump gets oil, ive tried 2 different guages, ive tried both guages on my 75 d100 ( also a 318 la) and both read 50 psi

any advice will be appreciated thank you
Do you still get 50 psi with a drill when priming and 25 when engine running, I am suspecting your distributor drive is damaged or broken.