My factory manuals called for Champions so I followed their
corporate advice for years, years of dealing with fouling and early
failure. I switched to Autolites about 10 years ago in all my Mopars and
never looked back.
Bill Roddick '64 Imperial Crown (triple-black) '72 'Cuda 340 (in pieces right now) '95 Concorde http://allaroundmopars.com