Sometime in the mid to late 1960's, GM deleted the ceramic resistor and went to a nickel/chrome resistance wire from the ignition switch to the coil. Check at your coil + terminal to see if there is a stiff silver-colored wire with woven fiberglass insulation. If so, that functions as a voltage dropping resistor. That wire is about 10 feet long, and it doubles back on itself inside the wiring harness. There should be a wire from the "I" terminal of the starter solenoid that also goes to the coil to bypass the resistor during cranking.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!