65Dartcharger, did you ever figure out your park brake cable routing?
If not on the 67, both cables route together towards the drivers side. There will be a bracket welded to the inboard side of the drivers side framerail with 2 holes to fit the cable ends through.
On the underside of the drivers side rear floorpan is a tack welded bracket that the single forward cable fits through from the handbrake. The forward cable has the adjustment threaded end. It fits into the center hole of the equalizer bracket. The 2 outer holes in this bracket have cupped holes for the ball ends of the 2 cables that go to the rear brakes.
Hope this helps
Matt