Use a '55 Chevy clutch fork and pivot.
You'll need to cut an access hole in the lower half of the bellhousing for clutch fork clearance.
Run your pedals through the floor, instead of on the firewall, and you can use mechanical linkage and do away with the slave cylinder. A simple clutch pedal with an arm extending downward below the pedal arm will pull a rod connecting the clutch to the fork. Almost a no-brainer.