Overcharging 68Dart...need some short fused help (pun intended:)

No you are reading the wrong section. I'm talking about the amp or current draw of the field or the rotor. When you take the field and connect direct to a battery, and monitor the current, and gently turn the pulley to rotate the brushes, it should only draw 4-6A or so depending on the alternator. "Back in the back" in the specifications it should show allowable amp draw

Your Fluke should work fine.

EDIT '68 book says

2.38 to 2.75 Maximum amper

I'm pretty sure later/ larger output ones can be more

'74 manual shows up to 3.4A

I did not find the procedure in the 68 book but 72 it is page 8-29, "Bench tests", "field coil draw"