Why the /6
I think the reason people like the slant, is why they like Mopar. There's a billion fords and chevys out there. Likewise, there's a million v8s. Dare to be different in a mopar? How about a mopar slant six?
If I wanted just power, I'd go to a v8. If I wanted easily recognizable, I'd go with Ford or Chevy.
But I pull up some place, and people are like "is that a nova? what is it?" They don't know it's a valiant. Then I pop the hood, and they see the strangest looking little engine, and a clean and easily accessible engine bay. Love it.