Folks,
This is likely to be a long post, so grab your favorite beverage and read on. This is the BEST setup I've seen for the master cylinder:
http://www.moderndriveline.com/catalog/hydraulic_masters.htm
Unfortunately, it was not available when I "home brewed" my hydraulic system. I did a BUNCH of research and found these problems and solutions:
>Different models of the Wilwood (and other brands) MC's, even with same bore size, have varying lengths of maximum stroke. A change from 3/4" to 1" master nearly "doubles" the amount of displacement, remembering that we are dealing with a circle for area=diameter divided by 2, squared x 3.14 and multiply that by the stroke for total displacement-volume. A small difference in diameter or stroke=a big change in volume.
Solutions:
1>Choose a master with the longest stroke available. The Wilwood "compact" and "integral reservoir compact" MC has a full 1.4" stroke as opposed to the 1.0" to 1.3" stroke of the "combination remote" and/or "compact remote combination" MC's.
2>Optimize the stroke that your pedal movement provides by:
A>Finding/measuring the point on your pedal that provides 1.4" of travel to the firewall in as close to a straight/perpendicular line as possible. Allow for carpet/padding, etc. or allow for a little extra stroke and put a small (1/4" to 3/4") wood or metal block as a stop under the pedal as the final step to avoid over traveling of the MC piston. On my 68, I don't recall if I had to drill the new hole in the pedal higher or lower the the stock one, but to get the MC in an optimum position required a slight relocation of the speedo cable. It was also quite close to the wiring harness. If you have a 68 (maybe 67, 69 & 70 are the same), I can provide you a template for the stiffener and spacer.
B>Remembering that as your pedal swings forward/backward, the point you have found on the pedal actually makes a slight arc, so position the MC straight to the center of that arc. This is not perfect, but at least minimizes the off-line up/down pressure on the piston.
C>Use a spherical rod end (heim joint) with a threaded coupler to attach/adjust the pedal to the MC rod. Besides putting a "stiffener" plate on the passenger compartment side of the firewall, you will likely need to put a spacer on the engine compartment side to allow proper fitment.
3>Most if not all of these difficulties can be avoided by using the Modern Driveline "mousetrap" system, linked above. The DazeCars "65-70 Mustang Offset Master Cylinder Pushrod" may do the trick, but I have not used it and suspect that it may not provide the proper stroke length.
As far as the slave is concerned, I do not like the DazeCars "T5 Hydraulic Clutch Bracket" (and many others similar to it), as it attaches to the transmission by those flimsy little tabs on the side of the transmission that simply don't seem sturdy enough for the task. The Modern Driveline bracket is a step in the right direction, except that, on a stock Ford T5 bell housing, the spot that attaches is kind of flimsy and insubstantial. The bracket design I like best is the one in the DazeCars "Tremec 3550, TKO 500/600 Hydraulic Clutch Kit" as it attaches to the bolts that hold the trans to the bell housing. Unfortunately, this style is not available for the T5 except from me for $50 plus shipping. I have a fabricator who will do these for us in water jet and leave them bare 3/8" steel plate.
I used a Wilwood 260-6089 for the 3/4" MC and the slave is for a late 80's - mid 90's chebbie full size pickup and has a bore of, I believe, .78-ish, is sturdy cast iron and has quite a long stroke available. FWIW, my setup has worked flawlessly for almost 3 years and 15,000 miles. I even still have the pedal assist spring installed, though I've been led to believe it is not needed or recommended.
Link to DazeCars:
http://dazed.home.bresnan.net/test#4
HTH,
Gene