Have you thought of running a smaller turbo eg. a GT28RS?
Stock internals best go for something nippier unless you plan to rebuild your engine with commitment and cash ready.
Putting in a fairly big turbo needs lotsa cash and research. Not just buying a GT35R and slap it into your motor. You need to consider fueling (fuel injectors and pump), oil pump (for me N1 oil pump is just crap. Go for a TOMEI if you can afford one or a JUN), Forged pistons and rods, race bearings, valvetrain (cams, valve springs, solid lifter conversion if possible) No use having such a big turbo on a RB25 and killing the spool at 7000-73000rpm.
There are much more to consider before commiting yourself for something bigger.