I flew mine last week with a Brisson 3.2 engine. Plenty of power. Turns 22-10 prop at 6,500 rpms. I think you'll find you'll have to add some tail weight on your plane to get the CG right. My engine is lighter than G-62. Don't fly the plane too nose heavy, it will be erratic at different throttle settings. Be sure to have enough elevator travel...you'll need it for the landing flair. Also add about 2 degrees of down thrust to the engine mount and it should be fine. Keep the speed up on landing approaches. Don't chop the throttle and let it settle down on its own. You need to fly it down over the runway about at 1/4 throttle then chop throttle and land. Its a nice flying plane. I beefed up my firewall with fiberglassing to strengthen the area. Be sure if you mounted your throttle servo in the engine compartment you don't get any radio interference while the engine is running. Be sure to do a radio distance check while the motor runs up. I didn't like the throttle servo so close to the engine ignition..in your case magneto
Good Luck,
Bob