Will a 20" 1974 50 HP Evinrude gearcase work on a 20" 1974 70 HP Evinrude <br /><br />Will a Johnson gearcase of same year, length, and 70 HP buckle up and work on the same year, size, and 70 HP Evinrude?<br /><br />Have lead on both that are apparently in very good condition but time is running out.