I would recommend finding out what the airframe is going to need in terms of engine weight in order to balance at CoG (as per the kit recommendation) and then select the engine closest to that weight. There's nothing more tragic than needing lead up front to balance when a bigger engine could do the trick!

I have no experiience with this particular model but someone who has may be able to help with this information. Otherwise, if possible, when building it, leave the engine fitment as late as possible and determine the balance weight yourself.

Let us know what you decide.