ignition resistor glowing red hot on back side?
Are you CERTAIN you have the correct side connected?
Are you using a factory coil or a "hotter" one?
What is your battery running/ charging voltage?
See here:
MyMopar - Mopar Forums & Information - Mopar Ballast Resistor Test
The BOTTOM side in this photo goes to the coil
I actually don't remember if I've ever tried to see if these ran red hot................