Front and Rear Sway Bar?

I've read that Mopars were often sprung too soft up front and too stiff in the back. To remedy this, a front sway bar adds balance but if one adds a rear bar to the car, it moves from an even handling car to one that over-steers and wants to spin.
The Chassis book is not for daily driver cars to haul groceries, go to the Post Office, Dr appts, etc. The book was for street-strip and road race tracks.