I went with a set of single shot AC injectors from David Lott at diesel innovations along with the gtp38r and regulated return. I love the set up, great with pulling an low egts, but also plenty of reliable power to play with. If u do injectors I would recommend a custom tuned chip as well for the best efficiency.
Hp and boost are probably the two big factors. From what I've heard you can push a good 450hp before worrying about head studs, boost I don't know. But if you have a gtp38r, thats only rated for 40 psi max of boost and 425hp. Just make sure the injectors don't put you over that
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