help? clutch wont disengage

I have a 72 Demon so I can't relate directly to your issue but I wonder if it could be the clutch pedal to torque shaft (z-bar) rod? The 67-76 is 1.5" longer than the 63-66. Either way I'm confident Wayne at Brewer's can help you figure this out. Wayne helped me when I was trying to get my combination of parts right for my Quick Time Bell Housing.

What also helped me was having the trans out so I could eyeball the alignment of the throw out bearing to make sure it was centered over the pressure plate.