I have a pacer front end in my 46 that I installed with my father. I had rebuilt the whole front end when we put it in. Dumb question but did you put new shocks and springs on it. There are two styles of springs you can buy for the Pacer...one is is standard set and the other a heavy duty set.
As for the rear...what do you have for a setup? I used the stock springs and helper springs on my truck but made custom shock mounts for the rear that really helped the rear. Your rear springs may be really shot and could use new or at least a shock setup to help the sway.
Here is a picture of the setup on the rear...
http://leahstockwell.com/pics/exhaust1%20pics%20058.jpgIt is kind of tough to see but basically we just boxed a small portion of the frame and made an upper mount and then used the spot on the stock leaf springs for the lower mount. Big difference.
