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If you mean efficiency in regards to an emission standpoint then kinda. The majority of the changes made to the engines during the 70's-80's was to pass the idle emission limits instituted by the state of California. The CIS cars were designed to run lean so timing was reduced to protect the engine AND to lower the nitrous oxide levels. The bumps in compression had very little to offer in regards to performance IMHO as I doubt you could "feel" it. My guess was to play with cylinder head temps. So if you do not have to run the engine that lean or adhear to the emission laws, then a ignition map with a more initial timing and a quicker ramp will yield much better results than a half a point of compression.
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Aaron.  F.S. 1965 Solex engine w carbs/cleaner
Burnham Performance
https://www.instagram.com/burnhamperformance/
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