I made a 4 bolt carb adapter for it and put a small Walbro on it
I only have a 16-10 Zinger on it and running it very rich I am getting around 6500 rpm..more when I lean it out I am sure. It does need a bigger prop though. Had another just like it on a Nosen Citabria and it had an 18-6 and flew well, plenty of power for a 12 lb. airplane.
I also made the prop adapter for it for the 1/2" shaft with a 10-32 retaining screw and key in the slot and a setscrew. Worked well enough to run it so far. Magnet imbedded in the back face for the Hall Effect sensor.

John