Well, I tried the solder trick to find the squish clearance.
The electrical solder I had was so fine I had to wrap it to make it thick enough.
Apparently you are supposed to measure parallel with the wrist pin.
I tried a few times and keep getting 0.081 to 0.083".
Again, my engine does not have EXACTLY stock pistons or head gaskets, but it has to be pretty close.
The 2nd picture is a spare cylinder head showing where the solder lays when you stick the solder down through the spark plug hole. You need to bend the solder so it lays fairly flat, and make the bend long enough to reach right to the cylinder wall.