steering and handeling help, 73 duster

I guess im getting from this that you dont have a front swaybar? That is a huge part of the equation. The alignment sounds run of the mill as well and I bet after it was driven the toe is now OUT with the fresh componets if it is a rut follower. What rear springs? If SS springs or it is "jacked up" like the car in your avatar then your caster is probably a train wreck. With that the car will wander,float and the steering will feel like it has no center. You probably get the car working good with a GOOD alignment and adding a swaybar. My alignment is 1/16" toe in, -1* camber and +5.75* caster. It drives as good as anything ive ever driven.