Just to clairify, my Dart is a 1969, which may be what's causing me issues with finding a direct plug and play with everything correct.
So, did a little more digging and reading. The harness I was looking at was the HU201AM (
1966-74 A B E-Body Engine Forward Light Harness). After reading the note on the bottom of the page it appears this harness, which is set up for electronic ignition and electronic voltage regulator, is for the 'newer' style voltage regulator (triangle connection, 1970+). My regulator is the 1969 and earlier style (
http://www.brewersperformance.com/prodimages/large/P3690732.jpg).
My second issue would be that my alternator is also the older style, single wire alternator (round style as opposed to the squareback style).
Looks to me like I'll either have to get the YearOne points ignition harness and modify it, or get this one and switch my voltage regulator to the newer style, as well as my alternator.
I believe that, even though more expensive, Evan's would probably make me a harness for the voltage regulator and alternator that I have, instead of me switching things or having to change wire runs and ends.