Pull out the carb, get a venturi (restrictor) made to replace the carb, and give it a try. Being of that age, and being a baffle piston, I am guessing that it would work fine as a stunt engine with 5% nitro/25% (or more) all castor fuel and a 10-5, or so, prop. I would be willing to surmise that the timing with the baffle piston would lend itself to a decent 4-2 *old timey* run.
Mongo