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"Will already" means that production engines built before March 1940 incorporated the modifications.
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There is nothing in that technical bulletin that reads engines produced before March 1940 will have the modification.
Once again, if it was the standard fuel in service, the Operating Instructions would reflect that.
They would not continue to publish 87 Octane Operating limits with scant references to the ability to use 100 Octane. They would publish the 100 Octane limits and the 87 Octane would be a foot note or a supplemental instruction.
Where is the 100 Octane fuel at the airfields in March??
