Thank you very much for your help and the tips you gave me.
I have requested information from FCA Heritage and am waiting for an answer. Uptill know we have a fairly good idea of the cars history from 1968 on, since it stayed in Belgium and switched owner only once, before my friend bought it some weeks ago.
It was owned by Guy Borgers, a navy officer in Zeebrugge and Ostend (B). His mother owned the local Alfa Romeo official dealership in the neighbourhood (Middelkerke) at that time. Their mecanic, Yvan Godderis, was the person who trained me when I was doing my Bachelor in Automotive Engineering in 1988, and when he started working in the dealership actually worked for Autodelta for a certain time, not only in the factory but was also mecanic for their F1 team in the beginning years.
We are currently in contact with the son of the in mean time passed away former owner, and hope the will have some more information. The dealership as far as I know went broke, so there will probably not be much paperwork or archive that was saved.
Guy Borgers raced the car, untill now we have 2 pictures of the car racing at the 12 hrs of Ostend Rally in 1968 and 1972. In 1968 it was still in its original white, was apparently repainted in 1972 (question is why), and we retrieved in again another colour, the car having been repainted in a experimental colour and paint, sponsored by a paint manufacturer. More pictures will follow. The car has been stored outside for more than 10 years,and was found in a barn under a load of junk in a barn. I hate to use the word barnfind, since I always ask myself where the hell people keep finding all those barns, but I know for sure this was a real one. The car was known to quite a lot of people and Alfa enthousiasts in the neighbourhood, but was never put up for sale untill shortly since the owner passed away.
The numberplate is interesting, since it seems to have followed the car over the years. This is not common in Belgium, normally the numberplate follows the subscriber to the plate and changes cars. And in this case even more, since it is what we call a "merchant plate". They are used by car dealers to put on their cars that are for sale, or which need a test ride, it is basicaly not a permanent plate. Based upon the pictures, the plate has been on the car since at least 1972, on 1968 picture shows a different one. This has one big disadvantage, namely, since the plate is not permanent for the car, it refers to the owner, and not the VIN of the car it is on. This means we don't have a link between the VIN and any kind op paperwork. We do have the paperwork for the plate, but it only mentions the owner, not the VIN.
Apparently the "merchant plates" in those days started with the letters NH. This also explains why you can find pictures in the internet of other Belgian GTA's with registration NH.389 and NH.342. These were the official cars of the then official Alfa Romeo importer ALFA BENELUX. They were raced in both rally and track races,as e.g. 24 hrs of Spa, and were driven by official Alfa Romeo pilots like Christine Beckers and Jacky Ickx, amonst others.
We suspect our car had a brief racing history in France, before it came to Belgium. However, SOPAR, the then french Alfa Romeo importer has an official list of the VIN numbers that officially raced for them, and our car is not listed.
If the car raced in France, it should thus have been a privateer, which seems doubtfull, or entered races in France under a non French registration. That's where magazines from that time could come in handy.
Anyway, the story behind this car seems to be as intriguing as the car itself, I will keep you posted.
Thank you so much for your help,