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Then I upgraded to the 78 amp version

Since you are going OE that is the one I would order: (85 M body iirc)



Robert,85 M body would be dual field,not correct.If you take one of the field wires to ground the dual field alternator will work, however the old mechanical type voltage regulators were not designed to take much more than 45-50 amps. Eventually the contacts on the mechanical type voltage regulator will fail when excessive current runs through them.