It seems obvious that HTC used the earlier engine in order to make the P-51B
significantly different from the P-51D. If you think about it, this should make P-51B vs P-51D fights more interesting since the performance advantage changes with altitude.
Hangtime; there were 350 P-51C-1-NT produced which had the V-1650-3. Out of the total 3738 P-51B/C produced, around 40% had the -3 engine, so it was quite common. I think the ultimate argument though, is that the P-51B as depicted in AH is Don Gentile's "Shangri-La" - s/n 44-6913, a P-51B-5-NA(It may well have had a Malcolm hood fitted though, anyone know?).
Looks like you may have to wear roundels in order to fly the Mustang you expected.
