What's the differences in the suspension between a RS and an IROC Camaro?

I.E., I want to have the handling of an IROC but I want to buy a RS because it'd be cheaper, plus I don't plan on keeping it very stock anyways. So what would I have to do to get the RS to handle like an IROC?

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89 iroc-z 305 tbi
k&n filtercharger, open element air filter. nuffin' else

 

Weld the shocks & struts up,,, that shoould give you the ride comfort of an IROC (or WS6 Bird)

Leave the RS springs & put the IROC sway bars on,,,,,that alone makes a world of difference. Besides larger sway bar sizes, outrageous rate springs were given for performance handling pkgs

 

Stiffer shocks along with a stiffer sway bar will make all the difference in the world in handling. Did the RS come with the big wheels? If not that would be the other diff.