I have the Evolution .46NT on mine. I'm using an APC 12.25x3.75. The .46NT seems to have more power than the TT .46 or OS .46FX. I later put the Tower muffler on it and gained around 1000 RPM.

To have ground clearance I put a 1/2" block under the main gear. I sanded a leading edge, covered it, and it looks good. You may want to consider doing something like this because it doesn't look bad at all if you shape it well, and they work.