Gilles,
Very nice car btw.
I don't have much to go on, what I do know is my car was built to compete in the Simca sports cup / Simca shell cup in France. Where upon it changed hands and was used for hill climb in Germany, due to the regulations it was modified and fitted with a Renault Alpine A310 body. Anyway 30 years later and I have it.
It has GRAC MT12 moulded on the rear uprights, but via via we have spoken with the original designer who doesn't have information of a 12. After further investigation I see my chassis is identical to the MT14. The only information I can find, apart from race results is this entry into LM and the 2.0ltr Simca sports race around the same date.
Anything you can dig up would gratefully received. Are you based in France ? as I understand its here the cars had most of their success.
Cheers Matt