Here's something else;
The Slanty clutch pedal ratio is different from a V8-pedal. Maybe that translates in to the freeplay issue as well.
Here's what's important;
after the Z-bar is installed and all the linkages etc. are hooked up, and the freeplay is adjusted; the Fork needs to be all the way towards the rad-side of the window in the BH with just enough room to install the boot.
If it is there and you still cannot get clutch departure, then almost obviously, there is a ratio problem.
If it is not there, but is further towards the back of the car, you'll have some hunting to do, as to the why of it. and most likely is that the fork-pivot is too short.
Other possibilities are; that the Z-bar clocking is wrong; or that the down rod is wrong; or the pedal is not parking correctly, none of which I have ever seen.
As others have said;
The Z-bar, in front view needs to be about parallel to the ground, and in Top view needs to be at 90* to the centerline of the car, and properly anchored on the bushings at the frame end.
There are more than one Bellhouse and matching pivots and different fork stand-offs, and even forks, made, so that mixing parts is not allowed.
Good luck