You would be better off money wise buying the parts you need individually rather than buying a kit, the Hotchkiss stuff seems to work good but is way too overpriced for me, I did some research on the Monte SS site and bought Moog springs front and rear, edelbrock boxed rear control arms, Monte SS front & rear swaybars and Bilstein shocks. Also a Just suspension rebuild kit to replace all of the old originals. By buying the sway bars used you will be able to get all of this stuff listed for less than half the price of the Hotchkiss kit. Also you will be able to pick the springs you need based on the handling characteristics you want and engine size rather than buying a one size fits all spring.
Hope this helps
Dave