i need to get lowering springs for my 1983 CAMARO Z28 but i need to know how much to lower it, the last thing i want to do is buy them and not be happy with them. Heres what i have: 1983 Z28 with the stock pre 85 ground FX kit(the pre 85 gfx are smaller then all the 85+ gfx so im thinking there would be a diffrence), 17" ROH snyper rims, 255 40ZR 17 tires, and a full 3" exhaust. i want to go as low as possible but i want to be able to get over speed bump and hilly driveways, granted i would have to go really slow. with my car/setup how much to i lower it? if anyone has pics to go along with it that would be great. i did do a search but no ones ever seems to mention if the pre 85 z28 gfx makes a diffrence on how low to go with my rims/tires and exhaust.