I have a 66 289 4vv. According to Ponycarbs when the car's timing is correct. The centerline of the vaccuum advance should be pointing at 7 o'clock. So if you are standing at the front of the car looking at the firewall. The fireweall would be 12 o'clock and the radiator would be 6 o'clock. The centerline of the vaccuum advance on mine is pointing at 6 o'clock. So I think my distributor is off by a tooth. Anyone know which way to turn the rotor so that when my car is timed the Vac Adv is in the right position at 7 o'clock?