I dont know whats different about my 1990 mustang GT but I had 255/75/15's on mine when I purchased it.  So how can I tell if he has done anything to MAKE those fit.   
 
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347 Stroker Motor: Balanced,  30lb Bosch Injectors, Cobra Computer, Cobra Transmission, GT40 Ported and Polished Upper and Lower, GT40 Milled Ported and Polished Heads, B303 Cam, BBK 1 5/8 Headers, March Underdrive Pulleys, Electric Fan, Accel Performance Coil, Accel 300+ Racing Wires, NGK Plugs, Ram Air, K&N Filter, 77mm Mass Air Unit,  FlowMaster Exhaust w/offroad H-Pipe, Hurst Short Throw Shifter, 3:55 Gears, Ram Clutch, Cross Drilled Rotors, High Tolerant Painted Calipers and Drums. 
		
	
		
		
		
		
		
		
		
		
		
	
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