A supercharger is all fine and well but that's going to cost an arm and a leg and trying to install one isn't for the shade-tree mechanic. Also, if you install a supercharger, you can expect your car to swill gas like someone punched a hole in the tank....you can't just bolt on a s/c and expect everything to be fine...you also need to upgrade your fuel pump, fuel injectors, fuel pressure regulator, ignition system, MAF meter as well as have a chip custom burned on a dyno to get everything to work in perfect harmony.
I would recommend basic stuff...cold air intake, underdrive pulleys, larger MAF meter, mid-length headers, off-road X-pipe or a high flow catted X-pipe, a good after-cat exaust system as well as gears(anything from 3.73-4.30 will work nicely). If you have a manual trans, go with a centerforce dual friction clutch and a short throw shifter...if you have an automatic trans, install a quality brand shift kit and a higher stall convertor. Then have a chip burned specifically for you modifications...you will spend about half of what you spend on a supercharger kit alone and get almost as much bang for your buck...plus you can always install "the juice" for when you need a little extra power.....
With those mods(less the nitrous) you should be able to turn low-13 to high-12 second quarter mile times on slicks...with nitrous you should be deep in the 12 second zone.
New Toy- Stone stock '88 T-bird Sport in need of some TLC
1988 Cougar XR-7- HO/T-5 conversion, cracked block prevented from reaching full potential.
RIP '88 T-Bird....firstname.lastname@example.org...best sleeper in So. Jersey, now it's taking a permanent dirt nap.