Well, not really a big Buick, it's an A body, same as the '70 Chevelle, same frame and suspension

Remember the '69 COPO Camaros? The same production order put the aluminum 427 into two Corvettes that year, for a total of 71 of the engines installed by the factory. I could be mistaken, but if I recall correctly, those two Corvettes carried no badges except two small "Lt-1" emblems in the interior

Somewhere I have the Classic Auto Restorer magazine that features one. I'll have to find it now!