A body with B body rear...Sway bar?

I have front and rear sway bars on my 67 fastback, and while it corners extremely flat, it tends strongly toward understeer. For autocross I would think you would want to be able to rotate with power; i.e. oversteer. I would try it w/o the bar to start.

On the other hand my car is very stable at high speeds, but that isn't an issue with autocross.