Yes to all of the above. I've bled brakes on this car and my old 68 camaro many many times in the past and never had a problem. Something is not right. Remember, this all started last week when suddenly the brake pedal went to the floor while driving. No fluid leaks anywhere.

What orher vacuum failure possibilities could there be? I have a new hose from the booster to the intake manifold fitting. Seems strange that the pedal gets even softer once you start the engine.