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According to AP1590B A.L. 4 (November 1940) the different sparking plugs are "very desirable" but not required. So using 100 octane with the regular sparking plugs seems to work, however it doesn't sound like a good idea. In addition it doesn't mean that the 100 octane plugs work satisfactory with 87 octane.
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The major change is the cylinder heads. Without those, you are going to have cracking.
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In addition it doesn't mean that the 100 octane plugs work satisfactory with 87 octane.
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Exactly. It specifies the four types of plugs which may be used for 100 Octane. You would have to look the spark plugs authorized for 87 Octane and see if any of them match the part numbers.
I actually have to put the certificate that comes with a set of plugs in the logbook of the aircraft we work on and sign it. It is a required entry and the certificate must state the plugs are authorized to use in the aircraft.
Aircraft maintenace is very tightly controlled by convention.