First, send me those numbers we discussed. Since the engine is a late model 235 instead of the original 216, there's a strong possibility you have a 12 volt (168 tooth) flywheel on that engine, which is correct for the 12V starter. Flywheells intended for use with a 6V starter have 139 teeth. Both starters drives have 9 teeth, but the pitch and the depth of the teeth are different to match the flywheels thery work with. 216 and 235 flywheels are interchangeable. The simplest way to be sure they match up properly is to just count how many teeth your flywheel has and buy the right starter.
Jerry
