Dont spend any of time converting that engine to put on that plane in my opinion.It wont put out enough power.I had 2 of them.They are on the heavy side.Youd be much better off with an echo 24cc,a stihl 25.4cc,a stihl 28cc.These are lighter engines and have more power.The stihl 28 is on the larger size but without knowing your wing area i cant say for sure.
A good echo 21cc might work if ya run it on gas/glow mix.I have a couple 22cc stihls that would work.
What size is your wing area.