In my 440 with a 10.5" clutch the fork ratio is about 2:1.
I'm using the same master and a different slave with the same specs for bore size and throw.
I had about 1" pull on the fork at the original attachment point with the pull slave and it wasn't enough for the Centerforce DF clutch. My master did not have anymore movement so I redrilled the clutch fork to make it 1.5:1 ratio and it's working with clearance for the throwout.
The clutch pedal is stiffer than I would like it but it is working fine.
I could not drill the clutch fork in the car because it's hardened steel so it had to be removed to work on it.