1964 Valiant

I appreciate the insight, as I know little to nothing about some of these issues. Regarding the alternator and regulator, Should I be looking for a grounded field regulator or switch out the voltage regulator to isolated (to match a new alternator)? The new wiring harnesses are OEM type from M&H. I’ve been told that I will likely need a new ammeter, but that seems to be a “good luck” find in the short term. The current ammeter is pegged in the middle, but I recall it flickering slightly before I smelled burned wire. I caught a pic of the back of the ammeter as best I could, with some of the damage evident,

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