First get clear about what you have so you know your options (and what to look for in a sister motor). If it's a 35, it's not a '56 -- but likely can use either '57 or '58 35 hp parts. These motors used 5 inch housing extensions bolted into place. You also may have a five inch brass connecter for the upper and lower shift rods -- means you would simply substitute the smaller connector to get a shorted shift shaft.