I just purchased a '79 B and it had a real missing problem. I checked the installed distrubtor from a '74 Midget and the points and plug wires were very old so I changed to a Petronix system and coil. I now have a problem as the new distrubutor has two wires (Red and Black) but I have three in the harness connection. White, White with blue and white with black. Which wire should be attached for the positive connection?