You do not need a press to remove the bushings.
I rebuilt my 65 El camino's frontend in a weekend.
You need a big hammer and a sleeve, for the sleeve
it need to be a bit larger then the bushing. I used
a pipe nipple, but you can go to a muffler shop and
have them cut a piece of tail pipe about 4 inchs.
Place the a-frame and bushing over the sleeve and
drive the bushing into the sleeve from the back side.
For the top a-frame the first bushing you'll need
to use a large punch, drive the bushing out using
the cross shift and the punch through the other bushing.
I also found that if you crush the inside of the bushing
with a punch Its easier to get out.

hope this helps bob