66 Dart sway bar

Original early A sway bars are kind of thin -less than 3/4 in in diameter. They do provide roll control considering the stock suspension. Start upgrading the suspension with larger torsion bars, better shocks, better tires, etc then a larger sway bar will compliment the upgrades. One you might consider and that I will be using on my 65 Dart wagon is the Helwig 1 & 1/8 hollow sway bar.