Thanks for the advice- The freewheel is making kind of a brief ratcheting sound each revolution of the wheel (while its on the bike- it doesnt make the sound while its off, and spins beautifully while off the hub). I have flushed the freewheel with Simple green and mineral spirits and submerged the whole thing in 30 weight motor oil but the sound persists. It sounds like a few of the pawls could be stuck in the wrong position
If theres something else I could do to fix the existing free wheel I'd rather keep the original vs getting a new one, but its almost 40 years old so it may be due for a change.
RS