That's an OS .46 VX-DF not FX. That engine wouldn't work without major surgery to the rear of the plane. It's a rear exhaust engine which means it won't fit in the stock location because the exhaust and carb would be into the rear of the fuselage. That engine is designed for high RPM's and a lot of concentrated cooling air moving past the head. I'm not even sure that engine will work properly with a prop instead of a ducted fan unit, maybe someone else can chime in and give you more info.