This might well be a good investment
https://oldchevytrucks.com/elw59.html
There should be a wire runnng from the IGN on the switch to the HEI and as far as ignition that is it with the stomp pedal starter.
With a 59 V8 with a key start you have the purple wire going the S post of the starter and a resistor Bypass wire running from the R post of the starter to the coil side of the resistor. That is because when you start the truck with the key you bypass the resistor to have 12 volts to the coil to start and the Ign post on the switch doesn't have power when you are cranking with the key.
I've looked at a number of GM trucks and cars that were freshly put together that wouldn't start when you cranked them with the key because there was no power to the IGN post meaning no power to the coil because the bypass wire wasn't hooked up. The last one had had an HEI swap on a V8 and because they removed the resistor and ran a new proper gauge wire from the switch to the coil they also removed the bypass wire and weren't getting any power to the distributor when cranking.
Thank 1project2many for this one that he posted in 2014. Scroll to post 12.
https://67-72chevytrucks.com/vboard/...d.php?t=643672
It looks like the green wire was the actual ignition wire.