Ok for street - maybe.
I'd put polyurethane in the sway bar links and bushings (with heavywall washer and tube on the links) first.
Then up the t-bar size - how much would depend on the tire stick, but .990 to 1.03" unless running high perfomance or (R-comp-autox or track) tires.
After that, decide from there what you feel it needs for where you feel its deficient, maybe shocks.
I'm always cautious with rear sway bars, especially on A-bodies. Too easy to end up in an oversteer situation at high speed or on a wet downhill curve.
