I considered an anti-roll bar, but I decided it wasn't necessary. Once I went to a 165 tire up front for the track, it didn't have any problems staying straight. I've never sprayed it with the skinnes up front, but there is only about a 9 mph difference (Damn NOS solenoids). I did put a set of airbags in the rear springs to help with the launch. It's a cheap fix that works real well. When I ran an 11.5 six years ago, I did it with big tires up front, so I ended up having to let out just before the traps. I was under the impression that an anti-roll bar fixed all these problems, but skinnier tires, and airbags did the trick. Going to an anti-roll bar really cuts into the cars driveability.
Kurt