My former 90 LX leaned bad. I'm a big boy at 240 lbs, but I even replaced the springs and measured the fender gap to find it didn't make any difference at all.
I saw on a web site somewhere a part that goes under the driver side spring to correctly rotate it so it fixes this problem. It was a long time ago when I saw this and I've looked all over for it and can't find it. It mentioned something about most Mustangs and other Ford cars developing a lean toward the driver side. So maybe it is a problem with most Ford cars.
Take a closer look at some of the Mustangs when you drive around. Since noticing mine having a problem I've unintentionally paid more attention to other Stangs to find that a lot of them have the same problem.
Maybe it's not in the springs and is more in all the various bushings and such. Maybe the ones on the driver side are worn more than the passenger side. Or maybe it's from a twisted uni-body?
I'd take the car to a frame or alignment shop and see if they can give you some ideas. When I asked about mine though even the pros didn't have a good answer other than hand over your checkbook 
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Project: 1988 Coupe - EFI 5.8L Twin Turbo with Victor intake, Canfield heads, F303 cam, March aluminum underdrive pulleys, TKO (or T56 if funds permit), PBR twin piston calipers and 13" rotors up front, 94 Cobra rear calipers and 12" rotors on the rear, 3.73's, Griggs K-member, tubular front control arms, torque arm and panhard bar, polished 99 Cobra wheels.
"The GR-40 kit installation is now complete, and the humble Fox-chassis car will now out-corner and out-stop a ZR-1 or a Viper, and support massive horsepower additions with perfect balance."
Griggs Racing
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