Though you may never autocross the car you may still want to consider upgrading the performance of that vehicle while you are there (or you can do it in stages as all our parts are in "kit" form or "a la carte"). I equate it to driving a decent handling dumptruck compared to a M3. I assure you you won't be disappointed.
Number One: Wheels and Tires
If you are keeping the steelies and 15's the suspension upgrades won't be as effective as a more performance oriented wheel and tire combo. It will still handle better, but there's more available.
Number Two: Control Arms and Spindles
For the best "all around" option you want to look into our spindles as well as control arms. The tall spindle provides a 2" drop over the stock spindle, but also moves the upper control arm mount up, thereby negating the need for the guldstrand mod:
http://www.ridetech.com/store/muscle...hash=V264.V328
When using our control arms you have to use a coil over or a Shockwave. Since you already have the rear set up (coil overs I'm guessing) this is no problem. Our coil over kit bolts right into that sub with only one modification. . .drilling the stock shock mounting hole to 3/4" to fit our Delrin Ball and Socket mount.
Number Three:
You might also consider our TruTurn system as it really makes that old ride feel like a new sports car (and works like hell. . .I've been able to run with, and beat, many cars with aftermarket sub frames.)
http://www.ridetech.com/store/tru-tu...gm-f-body.html