Nice setup, not mine, I just brought it to the races...I was the person on the flightline waving the flag on Friday and checking for start cuts the other days...
The engine was a 62cc Horner twin..
The cylinders are from a 50cc Homelite chainsaw...
It would need a gas carb, Hall sensor, and twin ignition..cost about $175...
I converted a few for customers in South Carolina some years ago, some were 4.8 with Sachs cylinders and some were 100cc with the Homelites....
They make a good sport engine, almost no vibration..Can't remember what prop, should be a 24-10 or 26-8....
Fuel mix the same as any other gasser, 32 or 50-1 with chainsaw oil....
If you want to run glow you can use methanol with Klotz at the same ratio...
You will probably need to rebuild the carb, the diaphragms will be stiff from sitting around unused for years....