P-63 would serve so much better in AHII.
One of the most contraversial things about it in WW2 was that the #2 allied Ace Aleksandr Pokryshkin had changed from P-39s to P-63s in 1944.
There definately is a visable difference in the two planes. Tail section, cockpit, wing, length, wingspan.... etc.
P-63 = End to the La-7