Nash, Studebaker, Packard, Chrysler, Oldsmobile, Pontiac, and a few others all used straight 8 engines. It was a logical upgrade from a six in terms of power and smoothness in a higher-priced vehicle than the Chevy/Dodge/Plymouth car lines. Ford used V8's instead of sixes, other than a very limited production run of flathead sixes from 1941-51.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!