Anti-sway bars

Well it will definitely reduce body roll and make the car handle better. I"m not the guy to ask though about understeer vs oversteer.
Lots of company's making good swaybars.
Hotchkis
PST
QA1
Hellwig
and others I cant think of right now.

p.s. If you have no sway bar at all right now, any bar, including a stock mopar a-body bar will be a great improvement.