Thanks guys! Especially you joeak47! Those vid's really helped a lot. I know machining, but nothing about engines, but I'm learning.
In your vid you say 11 or 12 degrees, so I split the difference and went 11 1/2. It measures 18 cc's.
Unfortunately, a ride report isn't gonna happen for a while. It's an ongoing winter project. It was put away dirty in a barn for years and needs a lot of work. I grabbed it for $350. As something to do this winter.
Also, I've never ridden a blaster before, so have nothing to compare it to.
I will be getting a template and doing a port and polish.
I also found a few goodies online. Going to pick them up tmrw. A Paul Turner pipe with Fmf silencer, elka's for the front, a stock carb, spare cylinder, tie rods with ends, & heel guard.