With big enough tires, a stock suspension can handle 1.4 60ft. I was doing 1.5's w/ soft launches and just 1 air bag, bone stock everything else.
The main difference between the two bars is the wolfe system is much more of a race only set up. It is deffinatey far superior to a ATR bar. A wolfe bar has arms that come down and are welded to the rear as well as being welded to the body on both sides.The wolfe bar is also adjustable. If the body comes down, all it can do is push down on the rear. The wolfe bar really shines though, when you launch the car, it will come up alot more evenly. It helps prevent body twisting, and gives you straighter launches at the track.
I would recommend going with the ATR unless you plan on lifting the front tires alot during launches. Because the wolf bar is welded to the rear, you will feel every bump in the rear.
If you are still considering the wolfe bar, i would reccomend calling Jack Cotton. After he almost hit the wall at the Nationals last year, he switched to a wolfe sway bar only (metco uppers and lowers) and he said the car then launched straight as an arrow.
Hope this helps a little....