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first mistake: KA engine. Do not use this for 500 horsepower unless you are rich.
The reason there is nothing jumping out at you that says "here is what you do with your KA for 500 horsepower" is because thousands of dollars have been spent on learning the weaknesses of the KA engine at that power level and nobody is willing to share that info for free.
If you want 500 horsepower your best bet is to simply buy an OEM 2JZ-GTE engine, slap on a precision turbocharger and a SAFC with some larger injectors. That is a reliable, daily drivable 500RWHP pump gas configuration with zero guesswork.
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