Hirsch Mustang ?
Hirsch is correct but I don't know about it ever being called a Mustang; think The Ford Motor Co. might have had something to say about that..
That was only part of the question answered however as I also asked for the car's power source and roughly when it was built. As it's a Friday and I'm feeling generous I'll give you a point however for coming up with the right name.
SACA beat me to it.
The car has a hand laid fiberglass body, with a tube frame. The front end and steering are Fiero, the rear is Datsun 280Z. Engine is a 1966 Mustang 289 V8 four barrel, with Ford 5 speed trans. It titled as a "1960 Hirsch".
That's more like the information I was looking for so I think I'll give Otto a point as well.
Apparently the car was made by some Los Angeles guys as a prototype intending to put it into production but realised it was not going to be feasible before anything got going.
I don't know why it's titled as a "1960" Hirsch as most of the parts used are from much later and it certainly doesn't look as early as 1960; I wonder if that's a typo somewhere along the line.
Here's another photo of the car (with Cobra slots) which just about exhausts my supply of pics!