Prime and fill
You should prime the pump (oil or pack with vasiline) and 3/4 fill the oil filter too. If the blower is out of the way, mark the CID position and pull the CID, pull an old CID out of the junk yard and pull off the gear. Then install that to prime the pump with a drill (maybe someone sell a tool for this), with the key on, the dash gauge will read pressure. Replace the CID and check the timing.