And now parking brake issues 66 Dart

Im not exactly sure what your asking me to measure. Are you talking about the end with the ball on it that originates at the brake drum and goes into the bracket about a foot or so in front of the brakes and attaches to the main parking cable?

Yep, measure the length from that welded on bracket to the end of the rear cable that those coupler brackets grab on to.

Bottom line is you've gotta figure out what's going on. If the replacement front and middle cables are the same length as the originals and the mounting brackets didn't move, something is up. Are the rear cables too short???