The best prop for the 2000 is going to be a 16-8. It's an old design and very large for a 1.2. They were good running and reliable engines.

The 2000 was the first, as I recall, big glow engine. Later ST came out with the 2500, 25cc or 1.5 cu. in. in the same case.

The 3000 and 3250 used a slightly diffrerent crankcase. It looked the same, but wasn't.