When i first added the springs and shocks years ago it stiffened my 87 cutlass up a ton....but it had the mushy "granny highway" ride to it prior.
It feels like it's on rails now though.
However, i have all new poly body bushings which stiffened it up, bmr upper a arms, factory lowers with new bushings, bmr front sway bar, bmr rear tubular upper control arms and boxed lower arms with poly bushings, and hotchkis control arm mount braces. I still need a new rear sway bar, umi shock tower brace, nd a front grand prix bar to finish it up. I wanted it to feel tight and it definitely does that for sure!