72 Dart Slant 6 225 Distributor cap question.

How do I figure out which number is which on the distributor cap? The wires could be mixed up, but i can't tell the diffrence between one and six on the distributor cap.

Number one is right between the clip and vacuum module. On the cap there is a little notch for a tab that comes off the module bracket -- that tab is just before the number one terminal. The rotor rotates clockwise.

1-5-3-6-2-4