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I recently built a 383 for my Duster i used a 509 lift mopar performance cam with stock rocker arms, it runs rough and when i bring up the RPM's it cracks and bangs out the exhaust. I have been told i need to use adjustable rocker arms with this big of a cam and the issues i'm having is caused...

I putting together a 383 for my Duster and i want to use Platinum plugs or even double platinum. The problem is i'm having trouble finding them, so far the only thing i can come up with is champion 3405 platinum. Anybody else using something different? Part numbers?