Back in '71 I spent six months in the lead booth on the "B" body line in Oshawa. If our jobs turned out that bad we would have heard about in quickly. When a new guy came into the lead booth, quality took a hit until he learned the job. At more than one a minute, you don't have much time. I think there were 3-4 guys on each side of the line, giving about 4 minutes start to finish. Each had a progressively finer disc. Our Baltimore built Chevelle had terribly finished roof joints. Even in silver you could see it from a few feet away. I always joke that, with my minimal talent, I could probably do an accurate body restoration. To make the cars truly nice you need the SCW or similar, but that isn't factory. Far too nice.

As for the L88 versus the L72, the stock exhaust hurt the L88 a lot more than the L72. Beare Motors sold an L88 Vette. The salesman took the cars for a little drive and told me that the L88 didn't really feel much different from the Chevelles as far as performance went. I've never ridden in an L88 car, (I'd like to) so I'm just going on what he said.
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Chevelleless after 46 years......but we did find a low mileage, six speed, silver 2005 Corvette. It will just have to do for now.