Throwing my hands up on this ignition!

If you have poor come and go connections in the cars wiring, none of the ignition systems will work right. I had the same conditions in a bone stock 73 valiant 318 2brl many years ago. Sometimes it would fire right up and run great. Other times no start or slow to start and ran like crap. I changed the coil and coil wire. I bought chrome box ECU. Almost every time I fecked with it, it would fool me into believing I had fixed it, until it went to chit again. I threw my hands up too. Parked that car and drove a Geo for about 2 years. When I had to put it back in the street, It fired right up and ran fine for nearly a month. Then same issues resurfaced.
First poor connection found in the blue wire was at ignition switch connector under dash. Next was same blue wire at bulkhead connector. That electronic ignition and 2brl carb are on my 67 273 today. Never was anything wrong with them.