When I had my 383 magnum rebuilt for the first time 25 years ago , I reused a Mopar 284/484 cam and lifters that I had installed the year before

Machine shop said cam and lifters looked fine , well
Lasted about a month , same situation as yours

Installed a new Mopar 284/484 cam and lifters , never took anything else apart on that new motor

25 years later , wiped out that same cam and lifters when I tapped a piston with the intake valve on my newly installed Edelbrock Heads

Long story short

432 Stroker now

Machine shop said all my bearings , crankshaft , cylinders looked good for a 25 year old motor

They did the short block , gave me all the old pistons , rods , crankshaft , bearings etc.

I took the oil pump apart this winter (This 25 year old motor had 75 psi hot at cruise and 35 psi at idle)

Inside the Melling HV oil pump it looked like someone took 60 grit sandpaper , a grinder , jack hammer you name it

I have no idea how it still rotated , it was that bad

Like I said , rest of the motor , bearings looked pretty damn decent


Replace the oil pump for piece of mind