Mike, don't put it back together. Each version of the G23 is specifically tuned to the intended application. Engine tuning is a compromise. Study the HP and torque charts a little closer and you'll see. The LH scooter engine emphasizes low end torque, much like a pickup truck engine. Tuned to haul a 200lbs over-weight kid from a standing start means the peak HP is not gonna be very impressive. The PU aircraft engine is only expected to whip a little propeller around, so top end power is more important.

My own G23 (sold by Horizon) doesn't lik to be propped downed too much. Lugging a 18x8, it couldn't even get close to 7000rpm. Strap on a 15x8, and it spools nicely up to 9000rpm.

I suspect your LH version will do well swinging a big ol' prop. Whether that's the type of engine you're after is entirely up to you.