Stop Me from Going Crazy ( Maybe too Late)

Could you have a coil that needs a resitor and running without a resistor, that would overheat the coil.

Does it act the same in winter or summer? Have you ever noticed frost on the carburetor throat where it bolts to the manifold? After it dies, how long before it will start and run again.
 Getting ragged after warming up is often a poor coil or could be condenser but getting the engine to smooth out at an idle by choking it, ususally indicates a fuel supply problem.
 I had a 66 Chevy truck that acted just like what you describe and fixed it by adding an insulator block between the carb and the manifold. It would frost up the carb throat driving 3 or 4 miles down the road and would loose power and die. Once the carb thawed out it would normally run the rest of the way to town. It was kinda like running a die grinder in the summer. It's hard to believe the flow of air can cause so much cooling to a surface that it will freeze in warm weather. I think the insulator block may have disrupted the air flow enough to eliminate the frosting. ?????????

Fuel line clog, fuel bowl and or screen, and finally, vapor lock is that unheard of, I had that once after getting a new cap, the pin hole had plastic in it !!!