Something to remember in the future, hinde site is always 20/20, gotta love it.

Before you pull the head, remove the cams. Now take the compression tester fitting. If you look at it, the end that the gauge couples to, looks just like a milton air hose fitting. Thats because it is. Take an airhose and hook it to the tester adapter. The engine may rotate the piston to BDC so dont have a wrench on the crank! Whichever valve is leaking, you will hear. If the exhaust valves are leaking, you will hear the air escaping out the exhaust. If the intake valves are leaking, you will hear it out the intake. This is a leakdown test.

Now if you hear Air comming out of the crankcase, then you are dealing with air escaping past the rings. In some cases this might be normal, like a motor that has not been broken in yet, or a 60's motor that is built to 60's specs and is cold...lol
You should do this before you pull the head, if you do it after the head is back on, you will might only catch a couple valves bent AFTER the motor is back together. You should do it after assembly anyhow but prior will give you more info to base your repairs on.