I have to agree with Jim Brannon.

From both as an observer, and one who has installed a heavy engine on a smaller plane. Landing a plane with a high wing loading can be interesting. It will need to have a faster glide speed, will require a longer landing roll out, and will have a very abrupt stall when you pull the nose up to flair and slow down to land. There will be little room for error. In flight it will have the tendency of snapping out of a less than perfect loop at the top and bottom unless the loop is made with a much larger diameter. The same thing will happen in tighter turns.

I can't with any authority say where the break point should be between the glow and gas powered planes, it depends a lot on the type of plane. In aerobatic planes, I personally think the 80" wingspan area is where it should be. A smaller plane will handle it to be certain, but with how much weight above and beyond what the plane should be at, but with what negative impacts to the flight qualities.

If you have to add a lot of nose weight to balance out a plane with the recommended size glow engine, then a gasser may work out. If you are needing to add tail weight to balance, then the gasser should be out of the question.