I was wrong twice...it wasn't few months ago but few days and I was not searching for a Toronado concept...
This is a Cadillac by Wayne Cady.
"Renderings often toyed with open or semi-open concepts. Wayne Cady, for example, sketched a concept car that was rather reminiscent of Classic 1930s speedsters. The circa 1963 concept car featured an open V-16, wore "Cyclone" badges, and had a plethora of hood air intakes. The rakish perimeter windscreen harmonized with the Buick-style bodyside "sweepspear" lines, but it would have been far too costly for series production."