Right, it's the Centaur. There was only one, and I did search for it, but you know how that goes... Maybe somebody can merge now?
I've given Quiller the point for the initial ID though 75america added the full info. It was based on a V8 Corvette for a Dr. Dean who felt a flashy sports car wasn't suitable for a man of his profession so had Intermeccanica build a '4 door Corvette' for him.
I've only ever seen photos of the car in an unfinished state though there must be some evidence of the completed car out there (why wasn't it in the Intermeccanica book though??), so another point is at stake for anyone that can provide an image of the finished article. I'd hope that it still exists somewhere out there too...