Ed,

The O.S. 40 4 stroke would sure haul it around with a lot of zip, that's for sure. It would also probably balance easier in that the Slowpokes and the Pete 'n Poke tend to need weight in the nose. As mentioned, mine is powered with the O.S. 26FS 4 stroke which has been discontinued but is a good match for my style of flying.

DaveB