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These cars can get real complicated and confusing. Now that black '67 just posted above is a 1967 Impala SS with a 427.
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The black car is what may have started the conversation. Certainly it was there at the event, although we all knew the difference between an Impala SS with a 427 (it's an original 396 car, BTW) and an SS427. There was a white ragtop that used to run the event.
The other guy who was involved in this discussion is not a Chevy guy, although he is the owner of a '70 Laurentian with a 454.