A BFG radial T/A is an S-speed rated tire with a softer sidewall and worse handling characteristics than the Z rated Comp T/A you're looking at. In fact, auto manufacturers recommend not using a tire with a lower speed rating that stock which in the case of a fox mustang GT, is a V-speed rated tire ('87-'93). An H-rated tire would be good enough for most performance use, but an S-speed rated tire is more of a higher mileage, lower cost, lower performance type driving tire.
Also what size rim are you using, is it a 15, 16 or 17 inch rim?
I would definately go with the comp T/A if those are your options. It's a good wearing/handling tire so it should be good for sprited driving.
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2005 Suzuki Hayabusa GSX1300-R
1980 Ford Thunderbird - 255 V8
ported heads, 5.0L ported stock headers, O.R. H-pipe and Flowmaster 2-chambers, dual roller timing chain
hi-po Mack Truck hood emblem
1985 Mustang GT 5.0L T5, F-303, GT40p, headers, off-road h, flowmasters, MSD stuff, etc.
Sold 02/06/04 
1989 Mustang GT ET: 13.304@102.29 mph (5-24-03)
Sold - 1998 Mustang Cobra coupe, 1/4 mile - street tires: 13.843@103.41 (bone stock)
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