It is a 1958 Cadillac (I had noticed the V and crest in the grille). Well, a special one. Youy might call it a Cadillac Gran Turismo. I paste below what they say in the website where I believe you found it.
[Unknown, USA?] Currently owned by a Norwegian collector, the owner heard it was a 1958 prototype, built in 1958, and that it toured with GM in 1959-62 as the Caddy Sports car of the future. It was titled, registered, and street driven in 1963 in PA, USA. It is titled as a "Special Construction" vehicle under Pennsylvania state Law, owing to the fact that it never went into factory production. It has an all-Fiberglass body built on a 1958 Cadillac chassis shortened by 25" and narrowed by 8". It is powered by a 1958 Cadillac engine bored out and modified to 450 ci. It features roller rockers and a ¾ street cam, with a 4 "Quadrajet" carburetor and manual choke. The car has power steering and power brakes and a manually operated, roll-down rear window. Originally white, the car features magnesium Keystone Classic Rims, a Hurst Dualgate shifter with lock-out. It currently has non-original tail-light lenses and radio.