[J P Stein]

You could write a book about the going ons with the P-38........but that has been done.

"Lightning" by Warren Brodie is about as close as you'll come to FACTS.
"Fork-Tailed Devil: The P-38" by Martin Caidin is another good un'.

The Allison was the only engine used by the P-38......tho K. Johnson and his crew had the plans to "Merlinize" the plane all drawn up......
The Allison grew from 950 HP to 1700 hp over the years (1939-1945) of its use on the P-38.

Or you could depend on the mis-information on the internet.

BTW, the P-51B was not made in any quantity when Yamamoto was shot down (April, 1943) & didn't make the Pacific theater till late 1944.
Also, Lindbergh shot down one Japanese plane flying a P-38......while testing.