I hate to tell you, but I have found it a lot easier to get a complete bench-bled unit from Ford. It is a little expensive, but works when you put it in. I have changed many Slave cylinders and master cylinders, and some bleed fine, some don't.
The last one I installed did fine. If the slave cylinder has a bleeder on it, just bleed it like a brake system. Pump the clutch, hold and bleed. Keep a check on fluid level.
If this doesn't work, let it sit over night and try again. Sometimes the air will work its way up.
If that doesn't work get a bench bled unit.