A-body chassis dynamics, handling

Yea, if the mount is moving, it needs to be strengthened. If you are looking for better handling then the small T-bar will not work. my understanding is the largest T-bar available is about 1.14" in dia. That, plus some new shocks (get some form of HD shock to compensate for the larger T-bar). Then make sure your rear springs are the stiff ones then go for a ride...