If he lowers it, consider this, it is a game changer on the S197 chassis.
http://fays2.net/
There are fancier versions but this is inexpensive, easy to mount, reversible and works.
Thanks for the input. Lowering will be the way to go.
The Watts Link replaces the Panhard bar and keeps the axle centered under car as well as lowering the roll center. Panhard bar jacks the axle to one side when driven hard.
It combined
with lowering springs will give the best results.
You can do even more if you replaced the upper control arm with a torque arm. It can get crazy but there is still room for improvement