HEI wiring question

You cannot delete the regulator unless you are converting to a "one wire" or other internally regulated alternator. The blue wire in the diagram is "switched 12V" that is, run in "ignition." It must be fed to coil positive, to the HEI power terminal, and remain connected to the regulator.

The brown wire coming out of the firewall is the coil bypass circuit and also must be jumpered to coil +