340/420 90psi Oil Pressure During Prime

If it is a new build, never run before you should see puddles on top of the head. Don’t panic if you don’t. If it is dry, you will want to pull the distributor and prime it again while slowly turning the engine over by hand. It will, at some point line the oil holes up and oil should flow to the head. (Each head gets oil at different point) It will also let you check to see if your lifters are spinning.