Just went through a clutch change. If the slave is working he has fluid, although if not bled properly it may not be moving enough to release the clutch. How is the pedal pressure? Couldn't have dropped your throwout, unless it somehow split in two. Maybe a bent fork so it's not pushing the throwout up far enough? Or the release prongs on the pressure plate are bent/worn, so once again you aren't pushing the pressure plate in far enough to release the clutch.

84 Ext. Cab Pickup.