Interesting find. A bit before my time so went looking for info.: These were apparently sold through the 60s - 70s. The reports show a pretty well developed carb for that gen.

Any manual? From what I found it ran a max up to 5% nitro, so would likely avoid anything higher.

Also, looks pre-Schnuerle. With the offset plug would think that is the case.

Also, with those bosses and lack of exhaust baffle it appears there should be a muffler option. Would be interested in what that looked like. Found pics of one with a home made dual stack, but no muffler yet.