Ok, here is a 10mph gain to 347mph list (and every Mossie pilot I've spoken with says it could hold over 350mph on the deck, so this is low I think):
Bf109G-2
Bf109G-6
Fw190A-5
P-38J
P-38L
P-47D-11
P-47D-25
P-47D-40
Ki-84-Ia
Spitfire Mk VIII
Spitfire Mk XVI
Even the pessimistic list has some major players in it, P-38J and L, Ki-84 and Spits 8 and 16.
More realistically we could expect a deck speed in the 350 to 355mph range.
All of this hinges, of course, on HTC finding new data about it.