Hotchkis rear leafs or rms 4 link? Any thoughts?

I adapted this panhard set-up. Made a huge difference in cornering quickness. Corners sharper. Also have an adjustable rear sway bar
http://www.mustangdepot.com/OnLineCa...ion/mr-phr.htm
$370 bucks not including Shocks

Check this out and works great. My frame rails were pretty close and didnt take much modifying.There are lots of people Road racing and Autoxing old mustangs . Lots of info