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As it has been said the 600hp mark is easily done with stock internals. I would check the motor and if it looks ok then I would spend my cash elsewhere. Just my two cents.
An amazing and proven turbo for the engine and power goal is a 6766 turbo with a T4 .81 a/r. Another option would be a 6266 with a T4 and a .96 a/r. If ur running E85 (recommend) I would run 1200cc injectors. Invest in a good standalone...ProEfi is a bit more expensive then most but the unit and capabilities are rediculous. Pm me if u need more info on the units. U can run twin walbros or Bosch 044 in tank and some -6 or -8 fuel lines...ur call but for those power goals I would stick with -6. Go with GSC S1 cams to help in mid to high end power especially with the 6766....those cams are mint with these turbos. I would also get at least bc springs and retainers if ur upgrading the cams while ur at it.
6766 + GSC S1 + 1200cc + adequate fuel system has made mid 500 to low 600 hp on 93 oct and 700+ on E85
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