Hmmm...Never had this happen before....

Just picked up an '84 D100 with the 225. No oil pressure whatsoever and a lot of noise. No knocking or squealing, just not a good noise.
Pulled the pan, everything looked okay, pulled the pump, there was part of the gasket in the pump and what looked like a gasket on the block as well as one on the pump.
Put new gaskets on and I have 35psi hot at idle (500rpm)
No noise, no problems. I think you'll be okay.....