I expect around 200 psi on stock, spica injected 2 liter motors. Since you are living in the US and posted this in the Alfetta Forum, you should have this motor.
Ideally, you should do your test with the engine at operating temperature, with a strong battery to get good cranking rpm, all 4 plugs removed and the throttles wide open. The readings should all be within 5% from highest to lowest. Uneven valve clearances can have some effect. Also, every gauge reads a little different.