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You can run NGK TR55's in the GT and it will run good. Thats what I used in my GT for the longest. You may not feel a gain, but you may see the ever so slightest of gains on the dyno.
i have a 96 gt with ngk iridium tr6's and ford racing 9mm wires. if there is a gain it doesnt register with the seat of the pants dyno but my car does start up quicker (used to take 2 or 3 tries, now just 1). the 9mm wires are bigger and have insulation to protect against electro interference from other electronic devices.