Dr.Deuce is right,tall lower ball joints can be very beneficial in the G chassis. BUT you`re not working in a vacume and there`s a lot more at play here than just ride height and camber curves. Roll center height, roll center migration, FVSA length and especially bumpsteer are all greatly affected as well. If you just want to lower the car trimming the springs is the quickest and by far the easiest way. If you want to greatly improve the handling and steering characteristics and lower the car some give us a call and we`ll fix you up with the proper height taller ball joints for your application. Expect roughly 3/4" of ride height reduction. Interestingly ride height reduction and ball joint stud height increase are
not 1:1. NOTE: If you make a substantial improvement in the geometry using tall ball joints the stock upper A arms will have to go. It will physically bolt together but you won`t be able to align the car even to stock specs let alone good performance specs and you`ll have limited bump travel without binding the upper ball joint in the arms so expect to change the arms as well. Basically the end result of doing what you want to do and doing it right is this
http://scandc.com/suspensions.htm#streetcomp2 
Mark SC&C