I have had a 3/4 bar on two cars. The one with stock springs broke the A frame right where the bar mounted. I have re-enforced both cars frame rails for the heavier bar. The one with stiffer front springs, 3/4 bar and rear spring work as well, corners like it's on rails on smooth pavement but is kinda tiring on the rough surface we are forced to drive on much of the time now days. I was setting another car up like the second car but am now thinking about removing the stiffer springs and shelving the 3/4 bar for stock springs and an 11/16's bar. Can't stand our road's!! So, I guess the decision is up to you as to whether your roads warrant the 3/4 bar.
Kurt