it depends on the controll arm too......generaly controll arms upper and lower help because the after market ones are stronger and don't flex as much.
then theres the bushing factor, many aftermarkets come with poly urathane ( stiffer) bushings.
then you have the adjustable lower controll arms which are more drag or road race oriented....
you have to b e carefull though. i've read some things that say urathane bushings aren't always the best for a street car. although most who drag race can use them no problems. something about the stiffer bushings can bind instead of flexing to let the rear axle keep straight. but everyone's probably going to have a diff opinion on that one.
actually in your case, if you removed the front sway bar and maybe got some adjustable shocks that would probably go a ways in helping your 60' times if thats whats on your mind.....
the secret is figuring out what you want to do with the car so if you still want it to handle decent you don't go over board with the drag suspension stuff.
there's plenty of guys in here and else where that have some pretty decent 60's but have not done anything too radical.....
mob's i believe mostly stock and does pretty well, rswoo7 car hooks great too but he's done alot more to his suspension i think.......those are just two guys in here that i can think of off the top of my head but there's others...