From an earlier post way back when:
"My personal opinion on spark plugs is that as long as you stay away from "gimmicky" plugs like split-fires and gap them correctly, you should be just fine in near-stock applications. Bosch, Champion and Autolite are all good plugs. I have read that platinum plugs last a bit longer, so it is going to be a personal preference.
Just my 2 cents..."
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98 GT
Dyno-Max cat-back exhaust, 3.73 gears, Steeda shifter, Ford Motorsport Underdrive pullies, 87mm MAF and Roush cold air kit...