Mopars and damp or wet weather often didn't mix very well. I recall the problem continued right up through the early 60s. I really don't know the exact cause but several neighbors with 40s and 50s versions had a heck of a time going off to work in the morning after a rainy night. 6s or 8s it didn't seem to matter.
I had 3 Slant sixes over the years and they weren't any trouble. 2 had points ignition and the last one had electronic. They did however suffer from the occasional blown ballast resistor.
