[DanEC]

You need to consider how much pedal swing room you have available. Basically lesser pedal pressure (smaller master cylinder) means longer pedal swing to disengage the clutch. Greater pedal pressure (larger master cylinder) means shorter pedal swing to disengage the clutch. A 3/4” master in my ERA uses just about all the pedal swing available from disengaged to fully engaged. I used a 7/8” MC for awhile which gave me shorter/quicker clutch action but the pedal pressure was higher than I liked.