Brake pedal goes to floor with engine running

Did you do the bleeding with the m/c cover or caps off?
I ran into this one time with the same results and was about to shoot the truck when i tried it with the cover off and it worked.
Gawd did i feel stupid.........
Other than that, i would guess the booster is toast or the one way valve on the top is stuck or faulty.
With the amount of pedal effort you say it has, it sounds like the booster is your problem.
When you pull the little valve out of the top of the booster, it should hiss with the vacuum escaping.
Try both.