I recently bought a 1990 fourwinns 18 ft open bow. the motor has a mod. # of302bmrjvb. according to specs i read this as a 1993. the carb has a 3.0 L air cleaner. it has a cobra stern drive with mod. # 985684. since this motor was changed i'm not sure what year this drive is cause the propeller iboat calls for is a 15 tooth 43/4 gearcase but the prop slides right over everything and i count 13 splines on the drive. i have no idea what year, h.p. or prop i should get. any info would be greatly appreciated.