RE: Everything Radial Engines
Dave:
7B? That makes yours a 2.00 engine, power about like a 120 single.
Weigh the engine without the exhaust ring - if it's right about 30-31 ounces it's the AAC version, no real worry about overheating. If it's heavier it has the steel sleeves with the aluminum muffs, don't idle it too long or sit on the ground with the engine running.
In either case it will still have the cast master rod, so keep the speed below 6000 rpm.
Tower and Hobby People, maybe Horizon as well, have Stearman and WACo biplanes in 120 size that should be fine with your engine.
A 16x6 prop should be about right.
Bill.