Run a cranking compression test. Just remember the idle circuit sees vacuum when the blades are closed. Once you open the throttle blades the vacuum generated falls away and the transfer slot begins to see more vacuum generated there.
Compression test cold cranking generates approximately 200PSI across all cylinders. It’s high I know but it is what it is. Also oil pressure is about 60PSI at start up dropping to about 50PSI hot soaked.