I'm really surprised that even air tools won't take them off. I used a 2 ft. 'breaker bar' (end of my jack handle) with my buddy on another bolt applying pressure in the opposite direction and we were able to get them all off. So, I guess I would try a breaker bar technique.
Good luck,
E
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1991 5.0 LX Coupe - 40,750 miles
331 cu. in. / Tremec 3550 / BFG Drag Radials
12.22 @ 114.31 mph - w/1.89 60'
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