It Started...!!!
After much fiddling and fixing I got it to fire a bit.
This engine was built as throttle governed as opposed to hit and miss.
It has a simple liquid fuel carburetor. I attached a propane gas demand regulator to the fuel boss and opened the needle valve 4-6 full turns. After messing with the air flow I got to actually run for some seconds.
Finally, after working on it for 3 weeks, this is a good milestone.
Video below.
Enjoy!
Gil