Oops,
Sorry, I didn't follow the link. I saw 80 inch wingspan and assumed too much.
Sorry. You absolutely would NOT want to put a gasser in that thing.
Once you get up to around the 12 to 15 lb range, glow engines become very expensive to operate. That one, however, will fly on an engine that will sip fuel. As suggested, a 70 class four stroke will fly it just fine. A .91 four stroke will give you all kinds of power. I have a clipped wing cub that flies great on a saito .56. My dad has one with a .91 magnum fs on it.