McLeod makes a hydraulic clutch kit. I looked at it pretty long and hard. Finally decided to stick to the stock mechanical. One of their selling points that caught my eye was that the hydraulic clutch allowed you to get away from header clearance problems.
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Not a real consideration relevant to your question. In the mid 60's I was forced to drive a Triumph TR-3. (After I bought the car, I enrolled in graduate school and didn't have any money to replace it.) It had a hydraulic clutch. Every few months, the master and slave hydraulic cylinder took turns failing. This was in addition to quite a few other things that regularly failed. In addition to by mostly theoretical electrical engineering courses, I also was forced into becoming an auto mechanic since I didn't have money to pay people to fix my car. I gradually came to enjoy working on cars. For my next comment....I'd expect that quality of hydraulic clutch systems is much better than my TR-3. That being said, as you can gather I'm a little snake bit when it comes to hydraulic clutches. I'd stick to the simple mechanical systems unless there was some other important motivator (i.e. headers). The new C6 Corvettes have hydraulic clutches I believe.