I'd look to changing the voltage regulator to a newer / adjustable one rather than changing the alt ( unless it is a drop in replacement ).
Some change the alternator to a higher amp unit in order to keep up with high loads. However, more amps only helps if you are outrunning your present alternator. RE: If your loads are 30 amps and you have a 50 A alt, there will be no benefit or damage in changing to a 100 A alt.
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