Caliper.
The distance he moved the clutch down had to do with getting a straight shot at the masters so the master push rod was not moving at an angle and loosing mechanical advatage. On mine it is about 1 to 1.5, I did not measure but it is close.
You never said if you were running a stock type clutch, hydrolic or if you car was an automatic. Anyway I am sure Jim would be happy to get you set up but I still think if I had it to do over I would get the Tilton pedals to work
Take a look here:
http://www.tiltonracing.com/content....list2&id=4&m=b
I think it would be far easier to do this than the route I took. Take a look at the drawings as it has measurements. You will need to cut holes in your firewall, but you will need to do that anyway. If you do this you will need to remove the stock brace/pedal locator and fab up something else.
If you like mine I will get you Jim's number