For one your engine is an STC so retiming is not as important as a fixed time engine. You have to make sure that nothing in the STC system leaks or you will have nothing but trouble.
You need to know the flow rate your injectors are being changed to, if they can't give you this number then I would use someplace else.
3804502 is the part number for a Holset HT60 that will be a good upgrade and work for that power level, do not buy a Borg Warner version.
Get back with us on the flow rates of the injectors and we will go from there.
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