1965 Dart Alternator ground

So I’m putting the 65 Dart back together after installing a new water pump but got to looking at the current alternator hookups and the ground doesn’t look right to me. The ground on this alt was gludged with a goofy bent two pronged connector to one of the alternator bracket bolts.

It charged fine with this set up before I took the alternator out it just seems like it should ground to chassis. Where was it originally grounded?

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