Beautiful car, but the description etc make me smile! All that work to restore the brakes, address the hand brake issues, and it still requires a wheel chock to hold it in position for pictures???? Hmmmm..... 
Clutch disc is on it's final legs????? Didn't the engine get pulled and replaced? No new clutch needed at this time!? Musta put some hard miles on it while it was in the museum??? 
It appears that many bits were updated.....AC condensor fan appears to be like later cars, or Panteras. AC pump is some sort of off the shelf solution, rotary.
The steering column is a bit of a mystery, but perhaps it went along with the "in dash AC vent" style.....perhaps an exercise by the factory to try something different....a peek into the future?
Perhaps this is one of those cars that got shoved off to the side during production....to be finished much later? Dates on windows could reveal more?
I didn't look for the reinforced ladder bar, or the frame braces to the side panels of the engine compartment, both "later" features....far beyond 820.....
Or it could be the results of more cooks than necessary to restore a Goose!!!
Still, I'd drive it!!!!
Steve