Stock bushings. I had a front and rear HI Perf sway bars installed with poly(think that's what you call them bushings. It was a waste of time as the contraption just cracked up my front and rear frames. These cars are straight line dragsters. If you want to F1 race with them you need to do more than just sway bars, start with new complete frame.
Engine Test Stand Playlist: https://www.youtube.com/playlist?list=PLwoxyUwptUcdqEb-o2ArqyiUaHW0G_C88 restoring my 1968 Firebird 400 HO convertible (Firedawg) 1965 Pontiac Catalina Safari Wagon 389 TriPower (Catwagon) 1999 JD AWS LX Lawn tractor 17hp (my daily driver) 2006 Sequoia 2017 Murano (wife's car) 202? Electric car 203? 68 Firebird /w electric engine 2007 Bayliner 175 runabout /w 3.0L Mercuiser__________________________________________________________