You say that your parts came from a 1972 124 Abarth. This was a special 'homologation' version (i.e. a certain no. had to be built in order to compete in certain forms of motorsport). It differed from the standard 124 Spider in many ways. If you have any of the parts from a 1972 car that are different from the standard Spider, they could be worth significant money to a collector, same with the manuals (as you probably know Abarth used a Scorpion as it's symbol).
I worked on some of these cars back in the day, so might be able to help you distinguish between 124 Spider and 124 Abarth parts.
Care to list or post pics of the parts you have?
Al.