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It probably would not pass emission test, but I don't think they tested in those days. There would be no nitrogen problem as the compression was lowered from 110psi to 75, and full throttle gave a cooler exhaust than before.
We also had a 1968 Cadillac that had the almost unheard of in those days of 10.75 to 1 compression ratio. In later years they dropped back to the industry standard of 8 to 1. It was pre Atkinson. The spec sheet said the intake valve closed 90 degrees after bottom dead center. It still required premium. It would ping at 60mph on regular on a slight hill. ONE cog retard solved that problem. It was happy with regular for the next 50,000 miles that we had it.
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