If he indeed has no oil pressure he has probably trashed the engine running it that long. He needs to tap in a secondary oil pressure gauge and briefly start the engine. If pressure great. If no pressure, he’s in for a tear down and rebuild. Since he’s working on a ‘69 Chevy P/U posting here is just fine.

Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne (Emily)
‘39 Dodge Business Coupe (Clarence)
“I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line"! Hug a cop!
USAF 1965-1969 Weather Observation Tech (I got paid to look at the clouds)