Well, it all depends on if you plan to improve the handling, or are just interested in dragstrip performance. I have the Eibach springs in mine, but they have a few drawbacks too. They take away much of the caster in the front alignment and you need to compensate for this if you use them. This is done with offset cross shafts in the upper control arms. I am doing the Global West tall spindle conversion with mine and ordered my arms with the offset shafts as part of the package. As for a street/strip car, you could probably just order a set of factory replacement springs from either Moog or TRW if the car is mild enough (12's or slower), or see if anyone offers a drag type spring set if the car is a bit faster.