Cheers guys.
What started it all was I need to convert the clutch back to hydraulic (t50 orig hyd, but this has been cable operated) and to do this I really need to put in a pedal box as there is no room to fit m/c on the firewall. So to do this I may as well fit a complete setup and I may as well at the same time set it up with adjustable balance bar and hydraulic h/brake and bias valve. So I also thought I could, if it was simply a bolt-on thing, I could replace calipers and rotors.
I will prob just leave w/clyinders and calipers and just do pedal box for now.
There's a awesome dude here in chch, Les Hunter, who is helping me at the mo sort out pedal box and correct size m/c's. Just got to build a frame to mount pedal box under steering column and it'll be sweet.
Here's Les's website. He really knows his stuff!!!
http://www.leshunterauto.com/home.htm