Mine is a 65 but has the exact same set up as is shown. He does not have the AC belt on but it goes in the front crank and front water pump pulleys that can be seen in his pics. It is fairly obvious that the belt contact patch on the alternator is miniscule. I would say 2 inches maximum. There is just no way this provides enough grip for the belt. As I stated above, switch to a regular belt and you will see a world of difference. Those stupid slotted belts did not even exist in the era.
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