Here's a couple more pics of the 69 Chevelle with cowl plenum. I tried to talk to the owner, but kept missing him. There was a buildsheet laying in the open trunk, but never got a good look at it. The car had all kinds of options like chambered exhaust, rosewood wheel, rear defog, etc.
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Rick
69 Chevelle SS396 Silver L78 M21 Post Sedan (Berger Chev.)
69 Chevelle SS396 Black L78 4-speed 4.10 Post Sedan

Don't text and drive.
Somebody's life may depend on it!