Yeah, this isn't the 80's anymore. Lot's of other engine options today that would work better than the G38. I have the 38 on some planes and it's a great engine....but like I said before, I would put something different on it. The ignition box mounting will be a challenge . On the Evolution the ignition is almost a third the size of a Rcexl or C&H and would fit inside the nacelle.  If you are going to use the 38 I'd leave it on mag ignition.