[05crewcab]

The diagram is correct.

Run a new 12ga wire from the ignition unfused terminal on the fuse block to the BAT terminal on the HEI (red wire above).

Then, there is a solid purple wire to your starter from the fuse box...keep this wire and the heavy + lead from the battery attached to the starter, and disconnect the yellow (it ties to a purple/orange resistance wire as well) from the starter and discard (not shown on diagram)

Follow the diagram and you are all set...only two wires and you'll be up and running.