Hey JM
remove distributor, insert long round stock with a flat end and hook up electric drill. spin oil pump and see if oil will come to gallery. It will take a while till all lines are filled. If you have the oil pressure gage hooked up check the pressure.
What did you do to the engine? did you had the oil pump our.
Did you had the distributor out? If so you might have not engaged the oilpump with the distributor shaft. If you are a touch to high with the distributor the shaft will not slide into the pump gear.
good luck
