Painless wiring starter relay
I did the painless in my 72 duster. Used the starter relay, and mounted to the drivers side kick panel up high under the dash, along with the fuse panel. as I don’t have a heater box in the car.
The starter relay is also the interlock for neutral. In theory you could bypass, but I don’t see the reason why you would.
If your going to run an MSD or such, I believe I hooked wires 931 and 933 together. It’s been a few years. But can look in the morning..