Does it function. You can check this while the car isnt running just put it in gear, clutch it and have someone push it. If it moves I wouldn't be too worried. That said, id expect it to be working exactly the same as if it were a 4ac setup as its the same thing with all the same parts except the clutch disc and pressure plate. Maybe you have the wrong throwout bearing and its too large for the space.
Is the throwout bearing properly seated on its carrier? Are you using the right slave cylinder? Is the clutch disc in backwards or some random assembly issue that binds shit up and causes problems. Is it running and what happens when you try and drive it.