It's a 1969. (with a 1968 engine) The wiring schematic in the shop manual calls the wire I'm talking about BLK-PURPLE. I think we're talking about the same wire. It goes from the big connector in the firewall to the coil +. I replaced it with a regular wire and also attached the red wire on the Pertronix Ignitor to the coil +.
Don't forget to turn the key to RUN for about five seconds before starting the car. It makes a difference. When I try to start it like a modern car it doesn't fire.
