Sorry, but I can't answer all of your questions..
The driveshaft is no problem,
Total length: 333mm
Bolt holes: 10mm
But for the gearbox..
The #00367 was rebuild from column to floor shift in the mid of -60s.
It will now be back to column shift, I have got nearly all parts. The tunnel case gearbox which I have was told to be the right one for this car, case is marked with 1365-15001. But when I now have a closer look to the removal fork, made of steel, I notice that holes are 12mm and not 10.. And sorry, part is mount on the box and nut is tighten, so I can't answer your last questions.
Perhaps my removal fork is for a later car?
I hope my pictures can help..
Giulia Sprint GT -65
Giulietta Sprint 750B -55