If you can make a case for adding the F8F, than you can make an equally good case for adding the P-51H

The FM2 isn't really an early-war plane either since it didn't enter production until mid 1943 or see action until January 1944, making it a contemporary of the P-51B.
While I agree that the early planes should have a separate place to be flown free from the later models, I also realize that such a place would still have the problems associated with the MA (ganging, running, etc). A P-40E isn't going to dogfight with a Zero any more than a P-51D is going to dogfight an N1K2.
J_A_B