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The roll center blocks correct for loss of suspension geometery on cars that are lowered by more than 1.5-2". When a car is lowered that far, the pivot point in the ball joint can actually be higher than the control arm bushing. This is detrimental to handling.
If you are going no more than the normal 1-1.5" drop in the front, they really aren't needed. Especially on the street. If you plan to run SCCA CSP autox, they're not allowed.
Poly bushings up front, and in the lower rear arms, are worth the investment, particularly if your current rubber bushings are in need of replacement. Do not put poly bushings in the rear upper arms. Bad karma.... The current bushings are probably due for replacement, unless they are less than 5 years old.
As for the rod end mod on the stay rod, I wouldn't do it on a street car. I cannot recall if this is an allowed mod for SCCA CSP. I don't *think* it is, but wouldn't put money on it. I'm pretty sure none of the spherical bearing's are legal in CSP, aside from possibly the stay rod.
Again, all of these are my opinions, based on a street driven car. A car that will only see track use is totally different. My buddy has a track-only FB, and it has all of the listed mods.
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