I have the 6AL-2 that has programmable timing and boost retard.All set with a laptop!
I have a non programable digital MSD 7 and a new MSD grid box sitting on the shelf waiting for the new drag car to get completed to go racing in
OP, Mopar electrical engineers and some of the other car makers wired all the early 12 V ignition systems that way to get 12 volts to the points while cranking on the starter to help those car start easier back in the day before solid state ignition systems where installed stock on the everyday cars