Should alternator be putting out 13-14 volts?

I've got my 65 Valiant 170 running pretty good. I had a good mechanic come over and tune it and we actually got it to where we could at least drive around the neighborhood. Got it up to around 50-60mph and it was doing good. It seems to run good now. He says it needed valve stem seals from sitting up too long. But also said the alternator wasn't charging enough. He said it should be charging 13-14 volts like a new car. Is that true on this old of a car? I've got all new wiring harnesses, new NOS ammeter, gauges are redone by Instrument Specialties, points type engine/light harness, dash harness from Year One, new 36 amp alternator from Napa, fairly new voltage regulator, and all new ignition parts. He said it was putting out 12 volts but should be putting out 13-14 and that the ammeter showed it was discharging. He said it will also effect the way the points work if it's not getting proper voltage so it would mess with the performance too. So what's right 12 or 13-14 volts charging?