94 V6 Clutch problem

I installed a centerforce clutch in my 94 firebird 3.4L a few months ago. After puting it all back together the clutch will not ingage unless you pump it (like there is air in the hydrolic system, which there shouldn't be because we never opened the line just unbolted the slave assembly from the tranny). I work in a garge so another tech thought that the seals in the slave might have blew out so i replaced the slave cylinder, still have the problem, so i replaced the master cylinder. Still had the problem so i took the whole hydrolic system out of the car (the resivior, the master cylinder and the slave cylinder) and tried to bleed the system. The problem is still there, any suggestions. Please help!!!