65 barracuda stock to formula S suspension conversion

IDK what the difference in suspension is, but, you can get XHD springs from MoPar to start with. I got my upgraded (1 inch over bend) springs from ESPO.com. The rest of the suspension can be upgraded via factory parts. IE: HD T-bars, KYB shocks, Addco sway bars (Anti roll bars) in thicker diameters, etc....

Welcome aboard!