Ummm.. that's quite a large engine for that plane. I would move up to something quite a bit larger for that size engine. I don't think the two engines are at all compatible with each other as far as putting them on a plane that size.

With that said, what is your experience level? Most gassers require some higher level skills to both build and fly. They are not as simple in the assembly/build process as the glow engine models are.

CGr.