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My hunch is that, for the Motorama car the Powerglide was simply convenient. For those early production cars, time was of the essence and there wasn't enough of it to develop a shifter for a manual transmission (at least not until 1955).
Ludvigsen's book is, in my opinion, what started the Corvette collecting hobby. Prior to its publication, early Corvettes were just interesting used cars. Subsequent to its publication, Corvette values began taking off. It's as if his book gave the Corvette the legitimacy that it needed but lacked.
Jim
I still use that book for reference. Learned most of what I know about early Corvettes from it.
Regarding the Powerglide... isn't it fascinating how it's used so much in drag racing now, when it was so maligned for so many years.
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.