I have a FS26 airplane engine. Its rather mild and easy going. I use a 10-5 APC on it. It runs in the low 9's

It starts and run easily and doesn't quit

You will need to change the crankshaft ($32.95) to the longer airplane model of the airplane 26. Also, you will need the prop drive washer, retaining washer for holding the prop.
http://www2.towerhobbies.com/cgi-bin...=++&search3=Go


Fuel draw will be a factor because the carb is mounted so far away from the center line. Will need some way to pressurize the tank or pump fuel to the carb yet regulate the fuel flow to prevent too much fuel getting to the carb in some situations. The added weight of the complexity may overshadow and advantages in power?