Re: Brakes won't bleed
"The combo valve on the frame, there's nothing that can go wrong with it that blocks off fluid to both ends of the car at the same time. forget it, what's changed here since the brakes worked right is the booster."
I'd try the spacer/washer trick.
with the master bolted on as now, no spacers, will fluid run out of the brake line fittings if you loosen the lines? If so, go down to the block, loosen the inlet fittings, fluid should run out. If it does, loosen the outlet lines, fluid should run out.
Tom Terrific or Terrible Tom, depending on the phase of the moon, passing cosmic rays or other factors not fully understood except by my wife.