sway bar

On an A body, there is rarely an improvement. If you want one, someone will sell you one. If I was going to get a rear sway bar, I'd get a matched set that was supposedly tuned for better handling. The only A-Body rear bar that came OEM was the police rear bar in 76? and that was probably specd by the police? The Formula S package handled very nice in an early A. If I wanted more, I'd look at Firm Feel.

https://firmfeel.com/collections/1960-1966-a-body/products/62-76-a-body-rear-sway-bar-3-4