I USED to have my Tower .46 in an Easy Sport 40 ARF, and it was barely enough to make it do anything interesting. It got boring enough that I didn't wait to have a reason to change the plane, and I got the Goldberg 330 Extreme 3D..... All I can say is WOW ! The engine has PLENTY of power now (running an 11 x 5 ) and it's finally FUN to fly !!!!! The plane went together REALLY well and for my first profile, it was a piece of cake ! If you want, I'll post a pic of my plane. Using standard JR servos, the plane balanced perfectly (no need for extra weight anywhere). The only thing I can suggest is that you mount your RX battery right under the fuel for proper balance and mount your engine with about 3/4" of a gap between it and the firewall.

Let us know what you decide !!!!!