I have a Top Flite P-47 fitted with a Magnum 108 2 stroke. I would not considered my model overpowered but it is heavy at about 12 pounds, mainly because I fitted every extra feature possible.

I agree with Jamie, if going with a 4 stroke use at least a 120 and pick a good brand. It will have to be mounted inverted to fit in the cowl, room in the cowl may help you make up your mind which to use. - John.