Martinue, I am curious about your knowlegde of the Angolan GTAms and GTAs. From my research, limited by not speaking Portuguese, there were at least two GTAms and several GTAs in Angola in the early 1970s. I have also found reference to a GTA with a special 2 litre motor.
The Alfanord website in Portugal mentions a GTA with the 2litre 240CV motor, as does the Sportscar Portugal website:
Sumário
Could this be the Chatz car you mention? If so the dates do not match as the results for the 6 hour race in Nova Lisboa in 1970 list the 2 litre car as finishing 3rd. Could there have been two GTAs in Angola with GTAm motors?
Hopefully attached are pictures of a couple of GTAms in Angola circa 1971-73. One is a RHD car for which I have very little info, the other is Jaime Melo.
I am curious as I am trying to document the history of my GTA Jr which came out of Angola via Portugal.
Regards, Don