Oiling problem. HELP!!!

A wise man, Ken Neve, once told me. When you tear into it and prime the oil pump, look for oil gushing out somewhere. There is your leak.

That's how I discovered the two plugs BEHIND the camshaft thrust plate missing. I had to make my own priming shaft, as they weren't available back then. I had my block on the engine stand torn down. When I primed it... Nothing...

Then my brother came into the garage and saw the drill with the pump sticking out of the block and just had to play with it... Suddenly a jet of oil came shooting out of the front towards me.. I went nuts, he thought I was going to hit him. I said, "do that again." So he did and that's how we found the leak. I wasn't going to hit him, I was excited to find the leak!!!

This was the 4th time I had to pull the engine to find the problem. Thanks to Ken's advice, I found the problem.

That engine would run up to 25 psi cold, then drop below 10 when it warmed up.