The Allies will need to wait for 1945 to have, in numbers, a plane capable for 470 mph and better. The XP-47J (I love that plane) was using the 'C' series R-2800, as was the P-47M/N, and it took some time to debug the P-47M's engine to work properly.
Feel free to contribute in any constructive manner to this and other discussions.
I think this is no "what if" thread!
Feel free to contribute in any constructive manner to this and other discussions.