Medium Gas Engine for Aerobatics

I'm looking for a high-performance medium-sized gas engine (0.40 to 0.60 cu in) specifically designed for aerobatic flying. The engine should have:

- Needle Valve Venturi
- High power-to-weight ratio
- Durability under extreme maneuvers
-Engine used for Control line flying

Ideal Skills and Experience:
- Experience with model airplane engines


Please provide specifications and any relevant experience.