Stock boxed arms with bushings and comp engineering shocks with an anti roll bar are good to 10 s. Some use the HR arms instead of boxing and bushing the stockers. The HR Anti roll bar is the top of the food chain but lots of Buick guys use the old ATR bar. This is a stock mount style and works very good. Stock GN springs go low 9s.
http://www.aggressiveauto.com/proddetail.asp?prod=SU00