and automomobile restoration is my hobby.
Nobozo is correct. The engine has to be at operating temperature, WOT, coil disconnected, and all plugs removed. You don't want to crank it too much as there is no oil pressure and may cause damage. Crank it just enough to give you a reading.
You will find a different reading on each cylinder. Usually 10% more or less from the factory specification is OK. If the engine was reconditioned and bored, the specification will change, usually lower.
If you really want a status of your engine health a leak test is better. But that is a whole new ball game.
