1996 GQ, re engined to td42

Replaced clutch flexible hose section with Nissan oem (so it still has the extra top bleed). Was a complete b because of various issues mainly to do with stripped threads, connections done up too tight, and me being a complete amateur

Anyway, cannot get the system bled. I’m suspecting an air leak somewhere. I have re tightened the connections we touched.

Just always getting air out the top bleed. No pressure in clutch.

When we press the clutch I hear an air noise under the bonnet. Is this normal (it could be something to do with the master cyclindernhousing)

Also when you press the clutch I see air bubbles coming up in the reservoir. Is this normal?