Not really worse
I don't think platinum plugs really hurt performance. They won't help it any though. I use them for longevity and certainly pay for that privilege. You will do just as well performancewise with plain copper plugs, but not better, IMHO.
Rev
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'66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi.
O.B.C. #2
'66 coupe
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