"The "mystery dream car" in the Chuck Fawcett photos from Road America is the 1951 Buick Le Sabre show car. It was designed by Harley Earl's studio and was eventually used by him as his personal car. And it's obviously a product of the Jet Age!"

And check out William's photos.  Great Meister Brauser shots!

(10-21-09)   From author and historian Michael T. Lynch:

"Dream car 2 is the 1951 Buick LeSabre, one of Harley Earle's greatest "dream cars".  Today they call them concept cars.  Not as romantic.. He used it as an everyday driver for years."