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I know these are not B bodies but I would think B&E cars would be the same for California.



That's the problem & source of confusion. You can't compare apples to oranges, in this case b-bodies to e-bodies or 1970 Coronets to 1968 Coronets or 440-4bbl to 440-6bbl.

On an e-body the SHAKER had nothing to do with N97 - "noise reduction".



Then please explain why the noise reduction is on the shaker car.

In California n95 + n96 got you n97 on an e body. I am sure that a few might have slipped through, but they would have been an anomaly. You must remember 1970 was the first year for earth day, and all kinds of pollution were targeted to be reduced including noise pollution. Here in California the intake volume through the fresh air system made enough noise along with the exhaust note to be over the limit, so you got n97.

Why does the 440 4 bbl have tips? Do you think the guy that bought the 6bbl didn't have the $20 for tips, or maybe he didn't want the ev2 shaker car to be too flashy with chrome tips?