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we do know that the changes were already in place so a number of the 700 would already have them.
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Glider, the document does not say the Merlin engine has been produced with the changes in place, it says the NEWER ENGINES will already have the modifications.
That sentence could mean:
1. That could mean all existing merlin engines from ~mid april 1940 or so would have the changes incorporated in production. Along with those production engines a maintenance stock of the new parts would have to be produced. That is a massive production undertaking and would take some time to implement.
2.
It could also mean the NEWER production engines, ie the Merlin IIX would incorporate the changes in their design. That makes the most sense and is exactly what we see in the Operating Notes!!!
Production priority would go to the newer designs and older ones would be upgraded over time on a schedule that the manufacturer could meet.
We do see that schedule listed as older models will be upgraded during their service maintenance.
Production resources are not infinite. The Spitfire Mk II was coming online and expected to replace the Spitfire Mk I. The Operating Notes are very clear in the fact 100 Octane was the only fuel approved for the Mk II.