You need enough pedal travel to stroke the Tilton master cylinder close to a full 1.1 inches to get full fluid transfer to the slave cylinder. There's a slight amount of play in the clutch pedal linkage that will need to get taken up also. I don't know what the clutch pedal ratio is. Bob recently said the slave cylinder is .81 inch in diameter. So with a 3/4 inch master cylinder (if that is what your car came with) and the slave cylinder being a little larger diameter than the master cylinder, a 1.1 inch master cylinder stroke will only move the slave cylinder about 1 inch. So, pedal travel is important if the clutch needs more fork movement to disengage. With 2 clutch discs, it makes sense that it might need more fork stroke - but they may compensate for that in the diapragm finger design.
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I still think you should try pre-loading the clutch through the linkage and see if the wheels are free to turn then.