Evin, that Evinrude is a 1953 or 54 15 hp. Good running motors and parts are available. Those three Johnsons might have enough parts to make one good one if you can buy them right. All are easy to work on with every day tools. It does take some diligent cleaning and some gasket making ability. Worst case is the motor being stuck. That is the first thing to check before buying. Stuck motors usually mean rusty bearings and stuck rings. Not so much fun with that problem.