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seems like all you needed was a new set of plugs and a ground test to check smooth running when using the 100 too...
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You really don't need to do anything to the engine to run 100 Octane fuel. The engine was made for 87 Octane and can run a higher knock limited performance fuel without penalty.
100 Octane has a higher lead content so changing plugs to one that are more resistant to fouling is not a bad idea.
The engine will not see any performance gains of the additional knock limited performance without modification as instructed by RAF. Those instructions to gain that performance benefit represent major modifications and inform when those major modifications where done. Those instructions have been posted ad-nauseum in this thread.