If its suppose to fly with a .60-.90 engine and it will have a wing loading of 26 oz sgft,with a gas engine on it youll be in the 30-35 oz sg ft.Thats warbird territory there.Youll be coming in hot for a landing and youll not be doing any 3D or very good aerobatics.I had my echo 24cc on a 1/4 scale Giles 202.The one from great planes,the arf.73 inch WS and more wing area and better loading than your plane and after 3 flights i took the engine off and sold the plane.My plane weighed 10.25 lbs.
I would either pick up a little larger plane,like an ARF from Nitro-planes.Av8tor that hangs out here in these forums bought the giles and put a 25cc homlite on it.Look up that thread.He might jump in here also.He has quite a few planes on gas/glow,mostly echos.
Im only being straight forward because i know you wont be satisfied like i was with a small plane.If you must use a small plane then look at jezmos thread[s] and see what he did with his glow conversions.I right now am converting a ST- G-2000 to gas or gas/glow.It was given to me with a bent crank.I straightnened it,and then i made an adaptor for a walbro carb so far.I have to get a new ring[dont ask] and then ill put it backtogether.Then ill post a pic.
What kind of plane are you looking to fly,what style of flying?We can help with a plane and engine combo with that info probably.