small block oil priming question

The dr head oils when the crank is at 20 deg ATDC #6 compression (use the tab as a ruler to get to 20) or cut a strip of paper 1.265" to use as a ruler & preoil with the drill/hex. Then go around to 90 deg (1/4 turn) BTDC #1 compression & preoil the pass head. There might be partial slits at 90/180/270 degrees & use the 90 degree one or cut a strip of paper 5.694" to use a ruler. then you can go forward a bit to for example 15 BTDC #1 compression for your initial. this might be a bit OCD but cam failures are epidemic & also I want to confirm that both heads are receiving oil.