That year nova has the same suspension as the first gen Camaro. For cheap i would do street stock style springs and spacers in the front. Something like this for springs http://www.speedwaymotors.com/AFCO-5...gs,23682.html#
and this for Shims http://www.speedwaymotors.com/Adjust...hims,3389.html shop around for better pricing. As for spring rates I am sure someone will chime in with a good starting point. I am not sure about the leaf spring rear.