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I might be wrong but i think the problem with the 425 on high hp engines is the lack air flow while being normally aspirated not the lack of fuel for the engine. From what I've noticed is that the engines run good and crisp at lower RPMs but richens up as the revs go up because it keeps up with the fuel demand but the engine cant suck in enough air through it. I'm sure it is not big enough for a real high HP turbo V8 but with the turbo forcing the air into the engine I'm sure it will get all the air it needs to burn the fuel from a 425. I think you could make 500 or so HP with the correct setup.
