I don't know the wing loading of the kit offhand but you may be putting five or six oz. heavier engine in a plane that already has a hefty wing loading. If you have to add tail weight to balance it you're up 15 or 20% in weight and will have no low-speed envelope (scale models stall just like real airplanes do.) You'll have to land hot, and with scale landing gear that won't be able to take a lot of banging. If you're on a rough grass strip it may be trouble.

Or not.