clutch pedal interchangeability

This is right off Big Block Dart.com's tech pages.

"Fortunately, this is one of the easier aspects of this swap. A large percentage of our beloved A-bodies were equipped with the slant-6, Three-on-the-tree combo, making clutch and brake pedal combos one of the easier A-body parts to find. This assembly is a bolt-in swap for an automatic car, as all necessary holes, etc. are already provided from the factory. Also, they remained basically unchanged from 1967-1976. A stiffener plate, (Torque shaft bracket) shown below, is also welded to the outboard driver's side frame rail just behind the front suspension area. This provides a rigid mounting area for the Z-bar pivot ball. As long as you're swiping the clutch/brake pedals, you'll need to grab this plate as well."

Although it does not mention the early A clutch setup, it clearly says "Also, they remained basically unchanged from 1967-1976." Paul is asking about interchangability only. He can work everything else out. He's just trying to find out if anybody has BOLTED in an early clutch pedal assembly in a later A body FROM an early one. He doesn't care about how many degrees the arm swings, how many molecules of steel VS iron, how many atoms make up the damned set or much of a carbon footprint was made forging them. He just wants to know WHAT WILL BOLT IN.