CA Models Funky setup
 

I have been flying a CA Models Funky for about 6 months. Its a great plane and has been a lot of fun to fly. It was my first kit and I learned alot in the process. I am now thinking about building another one.

My first one built a little heavy and has a TT pro 46 with a Tower muffler. It will 3D, but just lacks pull out authority.

In the next one I will probably try to save some weight in the build and gear.

My question has to do with the engine. How big an engine is practical for this plane? I know a 72 4s would be fine, but what about a 90 4s or what about a 75 or 90 2s? I have seen posts of people putting HUGE engines on the U can dos, so what would be an equivalent sized engine for the Funky?