[TomO]

I have a 68-12116 inner cap in front of me.

When the cap is held with the index mark up and looking at the side where the wires are plugged, 1 is top left, 3 is top right, 2 is bottom right and 4 is bottom left.

When the cap is held with the index down, 8 is top left, 7 is top right, 6 is bottom right and 5 is bottom left.

The diagram has the correct rotation, but 1 is oriented wrong, the drawing has the index for the passenger side at the point closest to the rotor and the drivers side has the index away from the rotor.

The earlier distributor caps have the same orientation and the difference is in the front to back distance. The rotor is still at the 11 o'clock position when the tang is at the 11 o'clock position. If the earlier rotor is used with the later caps, the rotor would not line up with the cap contacts. The same goes for the earlier caps with the later rotor.

This can easily be diagnosed by removing the coil and observing the rotor to cap contact alignment.