I'm building a HP30 at the moment and I'm going through the same problem.
First, heat the bushing just enough to push the inner (small) sleeve out.
Next, take a sawzall and cut the bushing from the center to the outer sleeve in several places. This will allow you to beat the bushing out with a chisel.
Finally, find the side of the outer sleeve that has the big "lip" on it. Take a small chisel and beat the lip to the inside all around the sleeve.
You should be able to chisel the sleeve out from the "non-lip" side at this point.
This is exactly how I just removed mine. I used a ball joint press to put the new ones in. Carquest keeps the bushings in stock. Pay attention to the bushing on the differential side. It doesn't go all the way in.
PM me if you have any questions. This project was a real pain in the balls.