Oil pressure question.

TT5.9mag said
MS877P (not 9) is a full grove main bearing set for 383 mopar.

edited to add link.
Clevite Engine Parts MS877P Clevite P-Series Main Bearings | Summit Racing

Thanks for fixing that. IMO, running full groove mains and a standard volume pump is just wrong. You don’t have enough volume coming out of the pump at low engine speeds to feed the rods full time.

I’d swap out a HV pump and see what you get.