stop trying to turn that bolt, thats what holds the harmonic balancer on
you need to loosen the 4 bolts that are on the inside perimeter, your kit should have come with 4 new bolts for it and they should loosen before it turns the crank
if it still does, put it in park with the rear wheels on the ground, put your emergency brake on too just to be sure
also, go ahead and tighten the balancer bolt back up too, if you loosened it much it could be bad, like your balancer falling off
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88 Notch, B&M Ripper, 3.73's, Ported E7's, Explorer int. w/ ported lower, pulleys, 1.7RR's, BBK headers, off-road H-pipe, flowmasters, subframes, 65mm TB, March ram air ,MSD coil, U/L control arms, 155lph f/p, Crane Adj.FPR, Nitto drag radials, best 1/4--> 13.76@101.4 on a 2.17 60ft