If you're staying above 14 volts, that's fantastic. But you should test with "normal" accessories on - lights, heater fan, etc and see if it's the same. I'd shoot for a 110-120A alternator, those should be pretty easy to locate - and relatively cheap, too. My stock 70A was pretty weak with much load applied, especially at idle (read first post in this thread for all the gory details).
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