AMC used a small plastic button to insure the oil pickup didn't bottom on the floor of the pan. Maybe a 1/4" tall.

re: 100 psi cold at idle

If the issue is not mechanical, then look at the oil 'grade', commonly called weight.
There's a chance that its too thick or too thin for the conditions (temperature, and bearing clearances)
100 psi seems high for slow idle - especially in the summer.