clutch pedal binding?

It sounds to me like the clutch doesn't have enough free play or the disc itself or throw out bearing is faulty.
Another possibility is the fork is bent slightly (twisted) and when everything heats up, there goes your free play/disc departure.
The first thing I would do would be put it on a lift and go under the car while someone moves the pedal from inside.
That should give you the source of where the noise is coming from, and in that area is the problem. (of course)
I'll take it for granted that you checked the centering of the bell housing with the crank when you installed it........
If that doesn't solve the problem, I would phone McCloud or Brewers for advice.

Let us know how it turns out/or is fixed so we all can learn from this!
@Dan Brewer