It appears to be an Iso Rivolta (the company) Iso Grifo, made from 1964-on in several different versions.....http://en.wikipedia.org/wiki/Iso_Grifo http://en.wikipedia.org/wiki/Iso_Rivolta http://en.wikipedia.org/wiki/Bizzarrini
Um, well, designed in '63, either a 300 or 350 hp Chevy 327 w/ a B-W 4 speed. Close enough for me! Later, *****6