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In most places it the only option available for ethanol free. Ethanol free below 91 octane is a rare item. A lot of small engines also seem to run far better on high octane as they don't have computers to compensate for the fuel conditions. All my Stihl 2 cycle stuff will barely run...

Detonation will ruin the rings, not necessarily due to the lack of lead. The 440 probably needs higher octane. The main problem with modern gas in old vehicles, other than valves is ethanol. Ethanol eats rubber gaskets, seals, o-rings, and hoses. You'll generally need to replace them with...