If your bearing clearances are right, the oil pressure should stabilize somewhere around 30 to 45 PSI at a hot idle. It's not uncommon for pressure to go above 60 on a cold start. As soon a the oil reaches operating temperature, the pressure will take a noticeable drop.
Of course, one of my roundtrack racing friends liked lots of oil pressure, so he installed a big-block oil pump on his 350, poured it full of 60 weight oil, and added several shims behind the pump relief spring. The engine would run for about 5 seconds, and stall. After about 10 tries, I told him to keep it running long enough for me to check the timing. He fired it up, and went to full throttle. It ran about 15 seconds, shuddered a lot, and blew the side out of the oil filter. It gave me a bath in warm racing oil, since I was leaning over the carburetor, trying to check the fuel and timing. His oil pump shims had completely blocked the relief valve, and the load on the pump drive was stalling the engine. It probably developed 500 pounds of oil pressure or more before the filter blew! There can be such a thing as too much oil pressure!
Jerry
