Duhawk49,

I have seen reports of people using a G26 for this plans. They typically take an 18" prop.
The way the plane sits, I don't think prop clearance will be your stumbling block but rather weight and the strength of the airframe.

I am putting an OS1.20FS w Pump in mine because a number of people have used that combination and said that engine suited this plane very well.
Apparently, the G26 is also a good choice for the plane.

Hope this helps

Ari