New 1967 Barracuda Owner!

Swaybars are a good option, many hi-po mopars came with front swaybars, you can use originals or aftermarket swaybars from Addco. They are mounted to tabs on the lower control arms which can be easily welded on. Ma Also, if you do install front and rear swaybars both, be sure the front is heavier, stiffer - if the rear swaybar is stronger than the front swaybar (or worse, rear swaybar only) the car will understeer dangerously. (I know, some people will say otherwise based on autocross applications, but in that case the very stiff front springs used acts as additional front anti-sway.)

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I liked most of this post but you made a mistake....
A car will not UNDERsteer with a rear sway bar only. It will OVERsteer.
UNDERsteer is a condition where the front of the car wants to lose traction and run wide on turns instead of gripping and turning as desired.
OVERsteer is where the rear of the car feels loose and wants to spin the car out in turns.

Simple rule: The end of the car with the firmest spring and sway bar will lose traction first.