As the OP stated it is a Falcon 56 MK-2. This plane had beam rails to mount the engine to. To go to gas (I haven't used any small gas engines) the rails and the entire nose might have to be cut off and a firewall might have to be made to mount the gas engine to. If i'm not mistaken, wasn't the stab and vertical fin held on with rubber bands on this plane? If it was a kif and not an ARF ( 20 years old?) then the wings and stab are covered with tissue or slik and dope. If you have someone there that built planes 20 years ago and is willing to help, Ok. If you have never flown anything, a small Park Zone electrict Cub would be a better trainer. After you have flown, then spend some time on this plane, make the repairs and fly it.........

Larry / Instructor