Max Speed of P-51H : 487mph or 471mph ?

[Metrallaroja]

So i looked very careful, but i can't find any chart showing that for the P-51H, it seem that value is either for the prototype of just estimated value for P-51H

While you are indeed correct that F-51H in service use the AN 01-60JF-1 fuel, which limit the MP to 80 inches Hg instead of 90 inches Hg likeAN-F-33 fuel
The performance in the SAC actually follow the NA-8284-A report which show the P-51H use 90Hp MP
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Top speed shown in this chart is 475 MPH which is roughly equal to 412 knots as indicated in the SAC
The only question now is whether this fighter has rocket rack and how much speed that reduce
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P-51H Performance

M Mike Williams Does this document say if design condition carried rocket racks? (P-51H Performance)
Also do you know from what date is the P-51H booklet?