A quick CliffsNotes-style history of the Grifo: The body of the Grifo was designed by Giorgetto Giugiaro. Much of the engineering was done by Giotto Bizzarrini. Bizzarrini designed two versions of this car. A "street" version, known as the A3/L and a competition version, known as the A3/C. Renzo Rivolta, owner of Iso, chose to build the A3/L, renaming it the Grifo. Bizzarrini went on to produce the competition version, first in cooperation with Iso and later on his own. Bizzarrini eventually created street versions of the A3/C, which he sold as Bizzarrini Stradas and Corsas.
Most Grifos were powered by Chevrolet Corvette engines. Everything fit well and the car had a sleek hood. In 1970 Iso created the Can Am version of the Grifo. This car had a Tri-Power version of the 427 engine (later a 454) in it. This did not fit well and the Grifo gained its Can Am (or "penthouse") hood. In 1972, Iso used Ford Boss 351 engines. This engine also required a "penthouse" on the hood.
This car has the Ford 351 engine in it. I can't find any site that lists how many were built this way, but with just 400 Grifos built in total, it's safe to say this is a very rare car.
This is certainly not your typical JaCG car, but it's just too unusual and too cool not to post.
Located somewhere in Italy, click here to see the eBay listing.