Just an update since I now have tried the 22x8 MA, wood, Schimitar. The engine seems to like this prop with the carb settings the way they are. Lots of thrust and still pretty high rpm's . I don't trust this tach but it is showing me 7,000 rpms and at full throttle it sounds like more to me. Of course this will all change when it's in the air. I would like to try a 23A Vess or 23x8 MA since the rpm's are still higher than I need (I think). Nothing left to do now except change the crankcase oil and hang it on a plane. Oh, I didn't mention that the hole in the choke butterfly needs to be soldered close so I can prime the engine when it's under the cowl.