If you do a search, I beleive that several on the site have made their own pressure bleeders for doing this. Personally, I gravity bleed first, then do the pedal pump thing. Unless you have installed speed bleeders, one thing you don't want to do is pump the pedal with the bleeder open, as this will allow the system to draw air in through the bleeder. A trick I do is to have a helper slowly pump the pedal while I hold a finger over the bleeder screw opening (finger acting as a one way valve) until the fluid comes out, then go on to the est of the bleeders. One thing I will mention, you should start bleeding from the longest line, not necessarily at the one futhest away from the master. In the case of the '55-'59s, that would be the left rear.