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Dan, you're saying you pump the pedal with the PB attached and pressurized?
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Yes. What I found was that with a total loss of pedal do to air in the lines you could not build enough pressure by using just the pedal method. If you used just the power bleeder, you would never actuate the master cylinder and are just moving fluid and the air can still ge trapped. By using the PB to pressurize the system you are able to use the pedal to move the brake fluid thru the MBC and lines. By doing the 3 pump on the pedal and then opening the (any 1) caliper at the top of the 4th stroke and closing by the bottom (the old fashioned bleed) you are able to start removing the air in the MBC and lines easier. Once you start to get firm pedal, or any pedal, you can start to reduce the PSI from the PB. Like I said, we just happened on this by accident. We were unable to get any pedal in my 71 and the PB was not removing the air at all. By using the PB/Pedal method we were able to remove all the air quickly.
Note #1 - I filled the PB with fluid (cheap stuff as you will go through alot!) so I wouldnt have to just deal with keeping the reservoir full with fluid.
Note #2 - this is a 2 person job and speed bleeders should not be used. You need to build pressure with the pedal and the speed bleeders will not allow that when open. The fluid will just flow when the pedal is pressed as they are designed to do. You must use the open at the top of pedal stroke and close at bottom to build pressure and remove the air. Speedbleeders work fine when the air is already removed and you are just changing fluid.
Note #3 - this is just my experience and I could be FOS.
Hope that makes more sense.