1965 Dodge Dart Charger

Was there a cover over the mounting bolts that holds the positive cable on the starter?

No.

I also got some new information last night. All carburator tags were aluminium with no color up to 1968 when they started adding blue for automatic, red for manual transmission and black tags for...?

I'll be interested to learn what you find out on this. I've seen natural (aluminum), gold, blue, red, black, and possibly green and violet tags.