Voltage at the coil is a good thing. The wire terminals on the coil may need some work - does the lower one have two wires connected to it or does it just look like that in the pictures?
The wire from the distributor to the coil may have an internal break that only causes a problem while the engine is running. Try removing the distributor cap and check the voltage at the points while wiggling the wire and moving the vacuum advance. (this happened to me - I used a wire that was too stiff and the movement of the vacuum advance fatigued the wire until it broke)
There are two wires coming off it. I'm not sure what that other one is all about.
I like the idea here, but could you explain it a little more in laymans terms? Sorry about that. Same voltage test? 20v DC ground black red on each point and wiggle which wire? The dark green? By moving the vaccum advance you mean opening and closing it?
Thank you for all of your patience. Honestly, I got this truck so I could learn more about larger engines which I'm afraid is a dying art, particularly in my generation (I'm 30). None of my friends in a nearby radius could help with this stuff. Plus the proficient mechanic nearby is $170/hr