I recieved my warranty Powermaster alternator. It is another 75a unit that shows as a 60a idle and a 99a total on the performance card.
I had my battery tested today and it checked 100% on life, so it is good.
I have a new AC Delco voltage regulator just in case the alternator does not fix the issue.
If this does not fix the ammeter/battery voltage fluctuation issue, then I might have to look into getting the MSD box reaplaced or looked at. I asked MSD if their box can create this ammeter/voltage issue and they said no. But I might look into a second opinion.

Thanks to all and I will test the alternator in the next couple of days when the weather allows.