I finally pulled the oil pan off and removed the oil pickup tube. it was not clogged.
the motor is on an engine stand now.
the motor has never been apart and only has a little over 70,000 miles on it but it is a 1972 so its old.
how can I tell if the bearings are the issue?
I would like to pull the heads and have them redone and continue to use the motor in my pickup. I was hoping to get by with just installing new rings and bearings since it is low mileage and still ran good.