GTX2863 is fantastic, I have one. Used to run it on internal gate, making around 330-360, but did have boost creep as previously mentioned. Switched to external gate eventually, been using that since making 380ish.
As far as bottom mount vs top mount. If you are sticking to under 400 bottom mount is way simpler, especially if you already have FMIC, piping, turbo outlet, and downpipe. All that bolts up. Top mount requires replacing all that, and typically top mount piping has to be custom made. Sounds like yours is RHD, so you at least don't have to deal with a lot of the shielding involved for LHD.
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