Found it. Lorena GT (with modified front bumper and radiator grille) from Porto Alegre RS, Brazil
Yes, that's it.
The front doesn't seem to fit and in fact it looks a bit like the front from a Miura..
I wondered if it was the prototype Lorena GT 2+2, which did have pop-up headlights, but I can't be sure so we'll call it solved!
Here is that front view: