Thanks for the answers, Gents.
Mine has the plastic rocker covers and an OS carburetor.
It's around five inches in diameter and has no name on it.
The guy I bought it from told me it was a Technopower, brand new and never run. He got it as part of an estate sale, took it out of the box and put it on display, never even mounted it on a plane.
I paid $25.00 for it.
That's all I know about it.
Bob Z.