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Just changed mine in my '99.... put in Autolite APP 103 (double platinum) gapped to .54. I have 85,000 on the first set and the boots looked like new. Put antisieze on the threads and di-electric grease on the boot ends and top. Torqued to 165 inch lbs. Truck runs like new !
Yes...those are the correct Motorcraft spark plugs. The gap range is the following: .052 - .056 inch. So...the .054 is in the acceptable range.
IMHO...YES...replace the boot while in there. They are not that expensive...and offer that extra piece of mind. OBTW...not sure AutoZone sells them?!?! If you have a NAPA near...they do.