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I'd upgrade the factory wiring even if I DIDN'T upgrade the alternator ...
You're leaving some voltage and some current capacity "on the table" with factory wiring as it is.
The Big 3 and a larger fusible link / megafuse will handle it, though.
Besides, do remember that the alternator will only put out as demanded ... it doesn't just shove 120A or so into the wiring, that just means it can supply up TO 120A.
RwP
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