Need handling help..

I'm disagreeing with adding ANYTHING until you get it sorted out AS IS. These old girls handle pretty damned good for what they are without sway bars when they are "RIGHT". Sounds to me like you have something "WRONG". I didn't see where you said you had it aligned. If you didn't have a front end alignment after doing all that work, it would certainly drive terribly. Sort out what you HAVE before you add anything or you may compound the problem and make it very difficult to diagnose. Sway bars do work well, but they compliment an already correct suspension. Adding one as a band aid for steering and suspension systems that are not correct will just complicate the issue.