Wondering if a replacement coil with an internal resistor would be an option for Nick’s effort?
Not just NO- - - - -"L- - - -NO!" The whole idea of using a coil that operates efficiently at around 9.5-10 volts is so there will be plenty of spark during a cold start. An internal resistance coil defeats all the engineering GM went to so the engine will start reliably in cold weather when the starter is drawing a lot of current.
Jerry