parking brake stuck

Very first thing is, do you have a factory shop manual? You can download a '69 Dart/ Charger manual here, which is similar for most of the chassis stuff

[ame="http://www.abodyjoe.com/pictures/Misc.%20car%20info/69%20dodge%20service%20manual.pdf"]http://www.abodyjoe.com/pictures/Misc.%20car%20info/69%20dodge%20service%20manual.pdf[/ame]

The cable should be routed similar to the diagram. Get under and release the bolt from the front cable at the junction of the equalizer (the "Y") "Yank" on the cable, using pliers or vise grips on the end to see if the cable seems stuck, or if the problem might be right in the rear drum brake.

the short answer is, you'll probably be taking the rear drums off very soon.