I've seen people replace the worthless nylon toothed timing gear with another worthless nylon gear, on a 70's Chevy LT1 no less. I will never be convinced they are facory. Chrysler did not use plated plugs. Who knows, the Factory had fixes for certain problems. Maybe that would explain your plugs. That being said, it is a small matter and does not really matter. I see no harm in using them, extra Insurance. I personally do not use the plugs.
