bucket,
There are no oil outlets/intakes on the passenger side of these engines,other than a factory drilled 1/4"npt plug in the middle of the cyl. head,just below the rocker cover,that is dead inline with the rocker arm oil feed.
Sometimes when the engine sludged up a bit a "mechanic" would tee in a copper line off the oil filter or oil sender port and run a line upover or up around the engine to the Pass side, to add to/augment the oil feed to te sludge starved rockers/valve train assm....
Not sayin its right,BUT
Quick fix and a cheap alternative to some cash poor souls who could,nt afford an almost sure rebuild.
Hope this helps....
Regards,and Happy new Year....