priming the oil pump

I’m currently in the same boat. I’ve got the rockers installed correctly with notches facing inside, the front of the block on left side and back on the block on right side. Only getting oil on passenger side rockers. I took the drivers side rockers off with no oil coming up at all through the head. I ran a drill while slowly turning over engine and still nothing. I was trying to avoid taking the intake off but I guess I’ll have to.

Someone was mentioning it could be an oil galley plug near the distributor. Anyone know if that’s a punch style plug or if it’s threaded?