Ring gear tooth count is the most important thing here. The 6 volt ring gear has 139 teeth and the 12 volt ring gear has 168 teeth. The flywheel has to match the starter you are going to use, 6 volt - 139 teeth, 12 volt - 168 teeth. After that is decided, then you can move on to the other issues.
The flywheel Drew P mentions will be 6 volt only. You will need a later model flywheel from either the 235 or the 261 - 55 to 62 for a 12 volt application.


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