removing upper control arm bushings

http://www.forabodiesonly.com/mopar/showthread.php?t=156654

Take a look at the "linked" posting above.
Another member invented a neat homemade tool to remove the bushings.
From your picture i think i noticed that your existing bushing has one of those reinforcement, round collars to it.
In my experience with ones that have those collars, they are pretty rusted to an old bushing itself.
Then you pretty much need to get a cut off wheel, and cut that collar off.
Or use a hydraulic press to press it out, with the receiving end of the arm braced with large diameter socket, or something, then press out the bushing.
A "flame wrench" would be nice too, to burn away, melt away, the bushing.
Do what ya gotta do, to get them out.