I'm really sorry I can't help you more on this, but here are some links:
This one is specifically on the 74 Bora
The "Maserati Bora Register"
I'd recommend trying to email someone on that last site to see if they can give you some more specific information. The first site isn't exactly what you're looking for and is dated 2004, but it might help you with the purchase. You could try google'ing Maserati clubs and attempt to find someone on those too.
Hope you find what you're looking for; wish I could help you more. It's awesome that you have a chance to get your hands on that. Good luck!
This one is specifically on the 74 Bora
The "Maserati Bora Register"
I'd recommend trying to email someone on that last site to see if they can give you some more specific information. The first site isn't exactly what you're looking for and is dated 2004, but it might help you with the purchase. You could try google'ing Maserati clubs and attempt to find someone on those too.
Hope you find what you're looking for; wish I could help you more. It's awesome that you have a chance to get your hands on that. Good luck!