Removing the isolators on the springs will lower the car a tad. It really depends on the condition of them. If they are not crushed you will see ~.250" drop.
If you can spare ~$150 get a set of SR lowering springs. They drop the car 1.5" and you really won't need anything else. Alignment shop was able to get my Mach 1 into spec with them in without plates.
Two other options though not highly recommended (by me anyways) would be to cut springs or throw on a tire with a larger sidewall ratio.
12 Black GT500 SVT PP l 2.6 Pulley/Idler l Airaid l o/r X l 305 NT555R's l Recaros l
04 Azure Blue Mach 1 / 03 Sonic Blue 3.8 / 14 Sterling Grey F150 FX4 402A 5.0 / 11 GT500 R.I.P.