I don't know if these are good or not, but I saw them on Jeg's and looked at them as a potential replacement on my Corvette. They do have them for your Nova:
http://www.globalwest.net/TLC%20Drag...uspension..htm
They're about $500 for a pair. Maybe somebody else can chime in as to how good they are, but it seems like they were made for drag racing applications.
Hope this helps...Good luck...