It has been my experience that you would want a 3/4" master cylinder for your clutch TOB.
Advantages in my opinion are: 1. Great for spaces that will not allow a traditional TOB and TOB fork. 2. Lease effort when depressing your clutch 3. and what else do you have to spend $3 or $4 hundred dollars on this week?
I have one in my Cobra and will also be in my coupe. The designs have been significantly improved over the last several years. The early McLeod versions tended to leak but mine has been in my car for 7 or 8 years and not a drop has leaked out.
Clois Harlan