I have never used a sway bar on an early style hotrod with coils and 4-bars and a Panhard rod.---And never seen any reason to. My cars all handled fine. I think on the heavier cars that were built after 1936 that sway bars were a necessary thing, because of the high center of gravity, and higher roll center, but on the pre 36 cars which were much lighter, I don't think you need them.---Brian