Parking brake cable retainers & grommets?

Funny thing about my car. It looks as though the parking brake is only setup to go to the left rear brake. Is it the same with your 68?
Also, where did you buy your cable and how did you route it? Seems as though my cable has been cut around the firewall area. From the handle to the brakes themselfs, how many cables are there?
Do you know id it's possible to setup the parking brake to the front disc brakes, maybe instead of using a line lock for racing?