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Rebuild the bottom end with forged pistons and rods, new OEM seals, bearings, etc. to be sure that you won't encounter problems down the road. After you do this, you'll have a bottom end that can support 350whp, that I can say for sure.
There is no set HP for any set of mods. The power you make is VERY dependent upon the tune, and your setup. 10psi on a small turbo is a very different scenario than 10psi on a very large turbo.