That is insane, my 65 Cuda still has it original untouched radiator.

I bet you have electrical flow thru the radiator, what do your grounds look like? Engine to body, engine to battery, battery to body?

https://board.moparts.org/ubbthreads/ubbthreads.php/ubb/showflat/Number/6413706/site_id/1

They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.