I see them in small block mopars when I buy a used one, my white 85 ramcharger had Champion plugs and it may have been the wrong temp but I put new NGK plugs in it and it was like night and day on start up, and my son said NGK and Autolite are the best for there stock cars. I understand the timing and carb and compression means a bunch but I have always been told they don't last.
