The car starts and runs great when it is at ambient temperature. I can start it several times in a row with no issues. After about 5 minutes or so of running it begins to run rough, lacks power, and acceleration. If I turn the car off and try to start it again, it will turn over fine but never start. I can let it sit for an hour or so and it starts fine. Recently, I have gone through the carburetor, distributor, generator, starting motor (was cranking slow), set the ignition timing, has new spark plugs, plug wires, no vacuum leaks that I am aware of, and the compression is good. The coil primary and secondary circuits are 1.5 ohms and 3.8k ohms.
Looking for some insight on the ignition system. The coil is of the original design with a removable resistor mounted on top at the "BAT" terminal. It is an old exposed "coiled wire" type resistor and gets hot (will burn your fingers) after a minute or so of the ignition being turned on. Is this a normal temperature? If not, what can I replace it with? Is the resistor in the circuit to lengthen the point life?