Sorrow, there was only a single (maybe two I don't remember) prototype of the Yak3 with the VK108 engine, but from the sources I have read, there were production Yak-3's with the 107.
The sources I have seen, say that the Yak-3 originally used the 105 due to shortages in the 107, but just similar to the Yak-9U, once engines were available they switched over.
Now how many were made (only reference I have seen says 100 produced), and when seems to be in question (some sources say prior to the end of the war, others say just after the war), no arguements there.
If you have some better data, I would love to see it, since I agree that its a murky subject.
Mostly I was just kidding, since I honestly never expect to see it in the game.
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Vermillion
**MOL**, Men of Leisure
"Real Men fly Radials, Nancy Boys fly Spitfires"