ya you're right karnak, thank you for the correction...
the ki-61-1 top top level speed (depending on source) ~350-368mph
the ki-100 (depending on source) 367-372mph
ki-84-1a (depending on source) 388-412mph
n1k2-j (depending on source) 363-370mph
the ki-84 numbers are a real head scratcher...had to do a lot of digging...2 different production engine possibilities and some discrepancies with fuel grades.