So the answer is: S L O W L Y!!
Because of other things, the vehicle sat for 36 hours and a large air bubble came out (drop in fluid level). We kept bleeding the slave cylinder for 75 minutes! Lots of success from clamping shut the rubber hose connecting the two lengths of rigid pipe, pumping the clutch pedal and tapping the pipe and firewall cylinder with the end of screw driver. Long project and not sure I have all the air out but I do have a functioning clutch again.