Juzz's numbers look correct to me.
Only thing that will outrun a Fw190D-9 using MW-50 on the deck is a Tempest.
Nashwan or RAM (I don't remember which) have been saying that the Spitfire MkXIV could do 400 on the deck. That is a number I have never come across. I have many, many reference books sitting right above me, and the speed that the Spitfire MkXIV is listed at on the dect is always 363mph.
The Spitfire MkXIV tops out at 448mph at 26,000ft.
The Spit XIV will also accelerate very well, climb fast and turn fast. She won't roll or dive particularly well, especially rolling at high speeds.
Frankly, the Luftwaffe here probably has more to fear from a Tempest MkV being introduced than from a Spitfire MkXIV as most of the fighting in AH is below 20,000ft. In addition the Tempest has 4 20mm Hispano MkV cannon as opposed to the Spit's 2 20mm Hispano MkII cannon and 4 .303 Brownings or 2 20mm Hispano MkII cannon and 2 .5 Brownings.
Sisu
-Karnak