First off, it would help if we know what your intentions are with the car. Street car? Race car? Road race? Dual purpose?
Lets assume for simplicity's sake it's a dual purpose car. One you plan on driving on the street mostly and the track ocassionally. The best thing to do here is a mix of rubber and urethane. The lower control arm on Mopars supports probably over 95% of the vehicle weight in the front.
So, that means road vibrations are transferred through the lower arms pretty good. Using regular rubber bushings in the lower control arm pivots will keep road vibration the same as stock.
I like to use urethane bushings in the upper control arms. This will aid in keeping the tires on the ground cornering on the street. Also, if you have a front sway bar, use urethane there as well. This will result in less flex and body roll.
Moving to the rear, most people make the mistake of using urethane in the leaf spring bushings. Wrong answer. Rubber bushings there actually help traction on the track by allowing a little more movement as the car leaves the line. This allows for just a little more bite on the track compared to urethane bushings. Using urethane on the leaf springs, the leaf spring will bow under launch and that's all. Using rubber, the leaf spring bows, reaches its limit and then transfers some more flex into the rubber bushings. Normally, you'd think this was a bad thing, but in a drag race situation, it's just the opposite.
Now, if you're doing some serious curve carving, you'll generally want to go with full urethane bushings everywhere, but take note. If you go to the strip, you will likely not have the traction that rubber bushings will allow and also you'll have more transference of road noise and vibration with all urethane. Like anything else, it's all a compromies. Just food for thought.