And, while you're at it and if you're lucky enough to find a factory pedal set, replace the old plastic bushing on the clutch pivot shaft with a bearing upgrade. Mustang Steve has the one I used and also Scott Drake has something as well. There will be some fettling required depending on the draft angle on the bracket. Also I strongly suggest go one step further and replace the linkage rod plastic bushings with oil-lite bronze. This will without doubt make the pedal pressure far less and the pain in your left leg as well. If you want, I can go further into detail as to what I did to improve mine.
There are many suitable clutches out there depending on your power and torque. My choice was the Centerforce II, but in hind-sight, I might have gone with the Centerforce Dual Friction. The CII has been in there ten year now without any issues.
As an alternative, I believe there are aftermarket pedal set ups available and I'm sure someone will be able to point you in the right direction.