My 2 cents- Not from personal experience, but the Mangusta with a smaller, less torquey engine, different linkage under the dash and a different set of parts from pedal to (different) flywheel, just don't seem to have clutch problems.
Next, with modern throwout bearings, free play is often no longer necessary, but one should not go past zero-clearance to an actual clutch preload. Mexican-made throwout bearings sometimes disassemble themselves during drives so they obviously are not well made. Finally, I've found that some Panteras no longer have the 1/8" thick steel motor-plate between the block and bell housing, which narrows the available clutch distance even more. It needs to be there. Ford was not involved at all- DeTomaso designed & built which may be significant.
One thing some guys miss: the Pantera effort reduction system was never offered as a new assembly so all added ones are take-outs. And they are built with a dozen unhardened steel to steel pivots which have NEVER been lubed, even at the factory. So after 50 yrs there's always wear which significantly cuts possible clutch throw distance. Some owners have gone through the system and added bearings or bushings for all the pivots but its an exacting, tedious machining job.