I dont know the wing size on that plane but considering the size of engines it calls for I think it's too small for a gas engine.

Gas engines don't put out as much power as glow engines do and they weigh more. If you try putting a gas engine on too small of plane you end up with a heavy underpowered plane. Really a 25% (quarter scale) is about as small a plane that you want to put gas on. There are even some 1/4 scale planes that do not work well with gas.