I had one of these planes i built from a kit way back in the early 80’s. I recall i had an OS 25 two stroke on it. Maybe that will help you on electric motor choice. I also recall i had just one servo for the ailerons, mounted in the top center of the wing. The main thing I remember is it was a great flying little plane that taught me lots in those early days of my RC flying.
Have fun with it!