I posted this article in another discussion which mentions that they "put the Chevrolet four-door hardtop roof on the Coupe de Ville". It doesn't mention anything about the 4 door though. That's the only reference to the Chevy roof that I have heard about.
Great article! I did find one section in error, where it states
"The 1963 powerplant contained enough meat to go out to 500 cubic inches, which it would for 1970. "
The 1963 390 engine displacement was increased to 429 cubic inches for 1964 by slightly increasing bore and stroke and would be used until 1967; however the 1968 472 engine was a much bigger & different block that would support increasing bore to support 500 cubic inches in 1970.
Comparatively and visually speaking the 1963/64 390/429 was closer in size to a Chevy small block while the BIG 472/500 engines were closer in size to a Chevy big block. I remember one time I brought in a parts car that had some 472 heads in the trunk and put them next to the 429 heads and I was like "holy cow, these things are huge!".
Liked this post a lot
I have owned a 63 Chevy super sport and my 64 Cadillacs —and first I have learned that the 64 Cadillac front grill was a design copy of the 63 Chevy front grill which I do see and understand once explained in the article
First I have learned the CDV hard top was a design copy of the 63 Chevy but did not apply to me being into convertibles only
Enjoyed learning that surprising info