I don't think we're going to make any more progress with this one so I think it's time to move it out of The Black Hole.
Allemano gets the point because he correctly described it as a Ford Mustang II Ghia concept from the mid 1970's.
What I was actually looking for was the name it was known by within Ford, and that was "Ford Italian Sports Car Mustang"!
They wanted a car that looked Italian and this is what Ghia came up with!