On that '76 Dodge, look for the ballast-resistor somewhere near that coil. They usually open, but if something has shorted yours (or some hammer-mechanic has eliminated it), that could be what's making your coil run hot. That resistor is not hard to find and not much money to buy, so you might just want to have the new one in hand and look for the thingie in your engine-bay that looks like it only older. If you find you've been feeding your coil the full 12V up 'til now, you might want to replace that after you've corrected the resistor-issue. It's probably toast inside; failure-any-mile-now, maybe with fire included. Wish you success.