hey roy,
i got the GP BEE GEE last summer and i put a ys 140 in it, a 120 would be more than enough power for it. as for flying it flew great, it was very stable going fast and slow. the only problem you have to watch out for is cross winds when landing, it will roll on you. the plane is very fast so do a few landing approuches before landing. it takes a while for the plane to lose air speed while landing. if landing on grass the plane tends to nose over after landing and slowing down. one more thing, keep the CG with in a 1/4 inch of the book spec's. it is a really cool looking plane in the air and low fly by's. good flying.
steve