Too much octane will have a negative effect on an engine not needing higher octane.
No; using fuel with more octane than the engine needs will have a negative effect on your wallet.
Well, I had a 400 with 5C heads and was running a blend which came to roughly 100 octane. I was at 8.8 to 1 compression. I did not know what heads were on car because they were ground off. When I switched to 87 octane, the car ran exceptionally better with no other modifications after I pulled heads and CC'd chambers. That was circa 1990 or so.
Anomoly?
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1967 Starlight black PMD Engineering 400 Auto 1968 Alpine Blue 400 4 speed 1968 Verdoro Green 400 HO 4 speed 2013 1LE 2SS/RS Inferno Orange Camaro.
