^^ I think what he is saying is that, those 625cc has a ceiling of around 420WHP (a little more at 4bar but not at your 450WHP limit) at pretty much 100% duty cycle.
Basically, for you upper/peak HP limit, you do not want to run more than 80-90% of the injector limit, as some injectors, once they go static (above 95% in some cases), they fail almost immediately.
Best bet is to go 1-2 sizes up (say around 750-800cc injectors)!
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