If your hurting for cash, then take the platinum plugs back to the store and exchange them for copper ones and get your refund. The coppers perform better. The only thing better than copper is the iridium plugs and they only seem to help if you don't have a strong enough ignition system or if your running a ton of boost or nitrous with a stock ignition system. On a N/A 5.0 iridium plugs won't make a difference and you can't beat the good ol' copper motorcraft or autolite plugs.
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393W: AFR 205's, hydraulic roller, TKO600.
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