Squeaking Sound Coming from 225 /6

I daily my ‘64 Dart (225 Slant 6) and usually have no issue. The past few weeks i had a low oil pressure light on, but had plenty of oil so I changed my oil a week or so ago.
MToday when I started my car, the engine didn’t so sound right, slightly bogged down, and when revved (in neutral), squeaked. I revved again and it’s squeaked again. I have enough oil according to the dipstick.

I suspect there’s an issue with the oil pump and the engine is running dry. Any thoughts?

So you saw 50 psi on the oil gauge? You just made Uncle Tony jealous.

You should take the valve cover off and see if you have good oil flow up there. If it's sludged up, take the rocker shaft off and clean out the rocker arm oil feed holes in the shaft as they're only about 1/8" diameter.

First thing I think of when a revved up engine squeaks is belts. Take off the belts, rev the engine and see if it still aqueaks.