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yes, the 4.5 v8 can supply 570hp, you're right but that power is reached at 9000RPM and the engine can give just "540Nm" of torque, the value of torque is too much low for a GT1 car and the limitrev is too much high for a GT racecar; surely the gt3 version of the engine will be similiar to the street car but with a lower revlimit for reliable reasons.
The 6.0 V12 that was used also by maserati mc12, in fia gt1 2010 had a power of around 560-570hp and almost 600Nm of torque with a revlimit usually kept on 7800RPM; similiar values of the dbr9 engine (that had a lower revlimit but much more torque), i think that this is the best option for a possible 458 GT1.
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