well, from what ive herd, the eibach lowers the car a little compared to stock, but if you want to lower your car and have better traction, 4cyl springs should lower it about 1.5" and you will hook up.
id go with the eibach though.....
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1988 Mustang GT, T-5
3.08's, No Smog Pump (Shorty Belt), Dynomax 2.5" Super Turbo Cat-Back, K&N Air Filter (Stock Air Box), Removed Air Silencer
14.691 @ 94.7 With A 2.24 60ft.
1988 Mustang GT