that rear suspension is technically called a 4 bar not a 4 link, and as you can see it is setup already with poly albeit non-articulating bushings. Several companies still sell that setup as "street". I don't think you will have a particular problem with binding in normal street driving. Its not as ideal for cornering as other setups in terms of performance, but I don't think you necessarily need to re-think the setup or bushings, although Jonny joints probably would free it up.
Other than the geometry of the IC and stuff, eg from a binding perspective, how different really is it from the DSE style 4 link that for example Stielow uses, the only difference I know about is they (DSE) use some big compliant rubber bushings that flex just a bit more than these poly bushings.
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Brian Hobaugh SCCA National Tour June 2014
First Hemi 'Cuda Convertible Ever Built
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