My suggestion is long. It took me several days. I called multiple places, nobody would touch them, they were all afraid of bending the arm.
First, glue pieces of wood as thick as the space between the sheetmetal. Then, cut a semi-circle the size of the bushing. put that in between the sheet metal so it won't let the arm bend.
Then, get a long, 1/2" bolt. Get a piece of plate steel 1/4" thick. Drill a 1/2" hole in it, then get a piece of wood, drill a hole in it the size of the largest part of the bushing, put that over one end, and the steel peice over that. Then, get washers, grind them to the size of the bushing side you need to push out. use a big socket or something round, metal and about the size of the bushing. Use that to keep the washer from bending. Use the bolt to pull the weird washer stuff and round thing towards the bushing, and it should pull the bushing out towards the piece of wood with the plate steel.
Then, when you tighten it to the point when you think it's about to break... get a BFH. Whack the end of the bolt with the round cylinder and washer stuff HARD. Do that a few times, and tighten it again, until you think it's about to break the bolt. Whack it again, and it should move even more, and keep doing that until it's done, it should take a couple cycles of tightening the bolt with all the other contraptions, and whacking on the end of it.
To put the new ones in, freeze them awhile, then, pop them into the thingy, and put them in with the sheetmetal stuff, the pounding works the best with installing the new ones, rather than taking out the old ones.
Just make sure you have the piece of wood with the semi-circle cut in it. That will keep the control arm from bending inwards.
I know what I said was all confusing, but "if you build it, [it] will come"... out.
I don't know if it's just me, but I had a hell of a time getting those things out, and my car isn't even rusty! Don't count on pushing it out by the rubber, when I tried that, it just popped the rubber right out of the bushing.
BTW: I only did my lower control arms, I replaced my uppers when I did the B-body brakes.