An 80 amp alternator should be sufficient enough to keep the battery up. The very later years may have needed 100amps with an electric fan, heated seats, bigger stereos etc. With those items off 80 is fine unless you have it idling the majority of time -- or your trips consist of 1 or 2 miles a dozen times a day. You should have your battery charged fully before coming to a conclusion and then check the voltage output of the alternator.
If your driving consists of mostly low speed short trips you may want to limit the drain with headlights, fan, A/C, etc. kept off. - Dave
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