If I were to go for that much power I would buy a built motor from Monkey Wrench Racing. You can select different options for what you want.
I wanted a reliable build without getting into the motor. I'm running 8.5psi for 230 crank hp and 195whp. It totally transformed my Corolla and I don't really feel the need for more power at this point. I've been told that the stock internals can handle 275hp at the crank but I didn't want to push it.
You should look at the turbo kit from Turbokits. They have a lot of options for the turbo to get the HP you want. The kit is also well design and has excellent build quality. My tuner said nothing but great things about it.
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