So here's the dealio... I've been messing with this clutch system for the past week. Basically, I am using a CNC 7/8" slave and a Wilwood 3/4" Master cylinder. Because the new MC was about 2" longer than the stock Mazda one (which is only 5/8" bore), I had to raise it up about 1" on the firewall so it wouldn't hit the tire when laid out. This also required me raising the clevis on the on the pedal 1".
I had a hell of a time bleeding the system, but I finally got all of the air out of it tonight. Had a nice firm clutch, but it did not have enough stroke to disengage the clutch.
So ultimately, I ended up ordering a Wilwood 1" bore MC tonight. If it comes in on Saturday, I will try to have it installed on the weekend. I know the 1" bore will push more fluid, thus giving me a longer stroke at the slave. It may increase the pressure needed on the pedal, but keep in mind I moved the clevis closer to the pivot point, giving me more leverage (less force needed to apply to the pedal).
Wish me luck! As soon as this baby works, it's time to test drive!