I went and messed with it some more. I can get it to run briefly. If I open the throttle all the way and crank it, she will start and not dump propane out the mixer. Can only do this if I open the tank, let the system pressurize, then shut the valve. Once I get it running, I can keep it running for a minute or so, by just barely cracking the valve. If I try opening the valve to much, it kills it.
Initially it fired and ran at 2000 rpm. Tried slowing it down with the idle speed, and got it down to about 1500 rpm. Anything below that and she quits. I know I have to mess with the timing and such, but no idea why it dumps propane out the mixer with tank valve wide open.
Probably need to rebuild the mixer and regulator.