If that is the engine I believe it is, it is an O.S. Rear Exhaust .61. If that's it, then I suggest a Brushfire.
Tha Brushfire is a Steve Rojecki designed plane that flies about as true as they come. Brushfires are available from Carolina Custom Aircraft.
For Prices and information please email
[email protected]. They will do their best to return all messages promptly.
Good Luck!
Gordon