Didn't notice many questions, rather just statements of what you'll be using.
No experience with the clutch, so no comments there.
1000cc injectors are overkill for pump, but will work fine.
Stock rails should be just fine.
Never used HPX either, so can't say much either. Stock setup uses twins, as you know - so your tuner has to be able to account for twins -> single. Same goes for fueling, need to disable fuel pump controller. Also single lambda conversion, fans etc.