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I don't have the specs for the SC430, but for the 2GS (which is close to the 3GS), the fronts are about 10mm and the rears are about 20mm from the no-fender-mod-needed area. Of course, current alignment specs, tires, drop, will affect it a bit but that's where I see the ballpark.
These are probably my favorite HRE wheel. If only the specs were a little friendlier. I hope the numbers help.
for SC430 the front will clear just fine especially its on 20x8.5. The rear however is a little bit over and given its 20" you will have rubbing issues I believe (a stretch tire may help but not completely mitigate the problem). The normal set up if you are going for 20x10.5 will be +29 (which you will still rub when going through a big dip). bottom line, with SC430 you will need to do minor fender mod.
THIS IS A GOOD DEAL, don't think this will last!!!