"1975 Plyouth Duster" Model

Thrashard340 said

I vaguely remember reading somewhere that GM might have used these on a Corvette back in the 60's.

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Just for fun I called the Holley tech line. After I asked him he put me on hold for about 10 minutes. The only answer I got was "They were made from the late 60's to the early seventy's, and we didn't make a whole lot of them."!!