oil press WAY TO HIGH during prime

If it makes you feel any better, I did something similar on a small block Chevy about 1980. Several items on big and small blocks interchange, including oil pumps. I put a high pressure/high volume big block pump on a 350 I built. Busted it off and my stewart warner mechanical gauge buried 120 PSI and then the filter blew off. Big mess. I have been there too. I learned real quick that too much ain't a good thing. lol