IPOOKforFUN (if that's your real name..),
There is a very good reason that I left the note about compression for the last. Fact of the matter is - a compression tester cannot tell you if a head gasket is leaking. All it can do is provide a compression figure.
Example: My Solo engine has a compression figure of 145#. My friend's Solo has 165#. Tell me, is my head gasket leaking? (Don't even bother).
Even if you know the specified compression, or have a figure from a previous known-good condition, a low compression reading tells you nothing at all about what is causing the loss of compression. Could be rings / piston, bad crank seals, bad reed valve, blockage in the ports, a leak at the compression release valve (actually, most Puchs don't have one) - or, of course, a leaking head gasket.
The tests I suggested all can help to pinpoint a bad head gasket. Unless you own an amazing compression tester with an LED on it that says "HEAD GASKET LEAK", I don't know what use it would be in determining the state of the head gasket, in the presence of so many other variables.
By the way, I don't take this personally. But, if someone is going to come along and try to contradict good information with bad, I am going to set that straight. Fair enough?