First a 1970 road runner was not a U code 440. Only 383, 440-6, or Hemi. The GTX was 440.
The 6 pack are dual point prestolite.

To be more specific, there were IBS-4014C 440-6 Early Manual, replaced by 4017 for Manual.
IBS-4014D 440-6 Auto replaced by 4017A

The above had the same chrysler number 2875981 Man and 2875982 Auto.

There also was the 4014G 3438314 for 70 440-6 Manual. Also early. 17D replaced this carrying same chrysler part number.

Then the IBS-4019 3438348 Man and the IBS-4019A 3438349 Auto these used the Chrysler Solenoid vacuum advance.