Found this site a few weeks ago and very, very, highly recommend it.
The Library section is chock a block full of interesting manuals.
They have just added several manuals for the Merlin engine.
https://www.aircorpsaviation.com/
Certainly worth the few dollars a month they charge.
Careful though cuz it's easy to get lost in it and not get to your chores!
I should add that they don't have a lot on the Spitfire, but they do have a lot on the P-40 and many others.
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