I don't know if I would bother with a built motor to push 350 whp. Sounds like that's about the top of the stock internals. I can understand wanting some headroom for reliability, but if I'm going through the time, effort, and money to build the motor, I'm going to also do the turbo and all the supporting mods to be at 450+ whp. Also, at that point, I would go with the SS, or ATS-V to stay with the ATS. It'll be easier, cheaper, and more reliable.
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