Greetings:
Be careful where you place the rudder servo, because the plane will tend to be tail heavy. If you don't place the rudder servo in tail as recommended you can use a smaller engine. I bolted a GMS 76 to the plane with the rudder in rear and it flies like a bat for you know where. The GMS has been very reliable, easy to tune and cheap. It is as good as the old K&B 60, which ran forever with a little castor oil in the fuel.