This was taken from Simon's post on the other website I find it is very good information and should be stickied.
From Mopar 2.2/FWD speed secrets & racing modifications
for Chrysler FWD cars book:
Front Springs:
85 lb.in. standard,
120 lb.in.heavy duty and firm feel,
145 lb.in. Shelby and 180 lb. in. MP Autocross and Rallying.
Rear Springs:
90 lb.in. standard
110 lb.in.HD, 135 lb.in. Shelby and
145 lb.in. MP Autocross and Rallying.
The LRE Autocross springs (according to Bill Lambros) are
195-200 lb.in. front
185 lb.in. in the rear.
A User named "Garret" added this
Mopar P4452205,P4552206 - 200/275
Suspension Techniques - 155/247 (linear rate (Garret))
Eibach 2801.140 - 200/260
Eibach 2804.140 - 303/330
Please Sticky Thanks, Chris