All the gear and no idea

[Olive855R]

First post so thought I might as well do it in the section I’m guessing I’ll be using mostly.
I’ve got an 850R(believe it or not)at the moment with an 18T and bigger injectors,Maf,jetex de cat etc.Its around 300bhp at moment.
I’ve just got hold of a K24 and S60R manifold but would like the turbo re curbed and manifold ported and question is who to use.
The injectors on it are Vxr ones,should I be changing these too to get the most out of the new turbo.
I’m not half as knowledgeable as most of you when it comes to tuning so it would be good to get some help.