oohh PLEASE remove them as soon as possible snake, get that caked on anti-seize off and dry the bottom 2 threads clean and close that gap, also smart advice is either plowing out the area around the plug before you take it out with forced air or sticking a vacuum cleaner fitting down into the plug area and sucking out any fine particles of dirt that might have fallen in after you removed the COP covers! I wanna save your motor from a plug backout and dirt hurting your cylinder wall!
I had a plug backout of my baby over a year ago (hence the Forged Rebuild) and I researched this matter Extensively! FYI my heads were machined with 9 plug threads when I had them sent out for new valves and a Hot Tanking!
Factory gap for the Normally aspirated is .054 but that's WAY To much for an 03-04, that's even to0 wide for an NA, I do.045 with NGK TR-5's.
Those 7IX's you got in there now are 2 heat ranges colder which your Eaton will LUV and the Iridium is a LONG Lasting Material, I'd still change them after 20K though, 10K for the TR-6's, it's cheap insurance and when you think about cost effective!
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99 SVT Cobra-Stock Teksid Block .020 over,Balanced Rotating Assembly,Manley Forged Pistons & H Beam Rods,Forged Cobra Crank,Stock HCI,Total Seal Plasma Moly Rings,Federal Mogul Bearings,ARP Studs,Melling Billet Oil Pump,Mac O/R H & Durablack 2.5 Catback,JLT RAI,Vogtland 1.6 Springs,Maximum Motorsports CC Plates,Subframes,Steeda Tri-Ax,Nitto 555's,U7146 Predator,Custom Diablo Tune,Member 7 Quart Club! 314HP/307Torq
Next:Polished Vortech V-2,60's,Aviator Pump& BAP,Billetflow IRS Brace & 500HP
Plug gap on pullied 2003 Mustang Cobra Termy ? 
. May slap a set in my R/T Dakota if I don't decide to cash/ clunker it for a new wifey Fusion.
