Installed new Clutch Master Cylinder, attempted to bleed it

Installed new Clutch Master Cylinder, attempted to bleed it while installed (did not bench bleed) have gone thru roughly a quart of dot3 brake fluid attempting to bleed it, no luck. Using the bleed valve on the transmission, just aft of the bell housing. Or actually in the bellhousing, it sticks out on the drivers side, just forward and above the fluid line attached to the slave cylinder. No leaks that are discernible, but clutch doesn't seem to want to bleed enough to even disengage the clutch. Not sure what I'm doing wrong.