Happy New Year Bill,
Apparently people could buy the parts from Chevrolet and build their own Black Widows because Chevrolet did not produce them at the factory. It looks like the injected cars were around in many different colors. NASCAR quickly canned the injected cars. The Black Widow still won a NASCAR championship with a carburetor. A really neat car.
http://www.57chevyblackwidow.com/album.html