[Excaliber]

It's common for Cobras to sit for a long while during construction and it's common for them to have a really high pressure clutch cover plate/spring pressure setup. The clutch disc is sandwhiched between the flywheel and pressure plate (clutch cover plate) under this great pressure. Moisture and pressure could be one reason the clutch disc wants to 'bond' with the flywheel and/or pressure plate. Dust/dirt on the surfaces during installation could add to the problem (glue). Any kind of dissimilar surfaces tend to 'glue' themselves together over time, and under pressure. Could happen to any car given the right conditions. I've encountered this problem on various cars over the years, all with one thing in common. They sat for an extended period of time.