On the cheap? try spring rubbers in the rear, the full circle nascar style rubbers. I had them in my 95 concord and it helped reduce the bad understeer. they sat tight between the coils, installs in minutes.
They add spring rate to the rear which will reduce the amount of understeer you car has.
Your talking body roll, might help some, but reducing the push will get you thru the twisties quicker.
More rear sway bar would be a better solution, but cost more.