SLS or new suspension

[newcoslvr]

Hey I just purchased a 190e 2.3 16Valve with only 60K on it. It's a little rusty, so i am embarking on a resto project. Been looking for one for a while!! My question is for anyone interested, is do i stick with the stock suspension, or do I convert to one of the new Spring shock combos out there? I researched a little, and sounds like the SLS was a bit of a marvel, but that was 1986! Also is the SLS power sucking because it is run by the exhaust cam?? Any info will be appreciated.