Do I need to add the LCA braces?

The question always asked are V8, cop car, and race bars too stiff; NO! My Dart is still sprung softer than my 300C AWD. /6 and small block engines are close in weight, big blocks will add 300 lbs or so the front end, look at a one inch plus bar diameters, you won’t be disappointed.

Swapping out torsion bars is a non invasive drivability upgrade that is easily reversed by a future owner/collector. By today, standards, all cars from the sixties were all grossly under sprung from the factory, and benefit from stiffer springs to meet the demands of a more aggressive driving environment.