Just some food for thought, as all the above conversions keep the original Z-Bar and clutch linkage.
If you go to a modern 5.0 bellhousing, It changes the throw-out arm mount to the reverse action, and the original clutch linkage will not work. But, if you are willing to be a little more open, then do a hydraulic clutch conversion, and your left leg with REALLY thank you!
To really make the clutch smooth, add the pedal modifications where the bushings are changed to roller bearings. Makes the clutch pedal feel like shifting a Toyota.
These parts (Hydraulic conversion, pedal bearings) are available as bolt-ins, just takes some research.
I did the hydraulic conversion on mine, and run a SPEC semi-race clutch, smooth as butter. T5Z behind.
On my old 69 Big Block, did the pedal mod, as most of our cars tend to elongate and destroy the pedal pivot holes on the steering column mount.
Both mods are relatively hidden, not a glaring mod, and accepted by almost everybody but the non-driving purists. Again, a little more work and cost, but like all other on the thread, makes driving so much better!