Well H&R has a few springs which lower more in the front, than in the rear. The H&R Super Sports for example, part # 51650-77 lowers about 1.5 inches in the front, 1.0 in the rear. You could add some isolators to the rear to lessen the drop a tad.
Here is a link...
http://www.stangsuspension.com/store...?idproduct=303
and for the rear isolators
http://www.stangsuspension.com/store...?idProduct=234
The isolators will shave off about 1/4 of an inch off the rear drop, and get you right where you want to be!