well why didnt you say so, half the work is done already.
For 3k you want some form of boltup highflow, many places do these, hypergear, GCG, ATP to name a few, looking at about 1500 for this
You will also need a ECU about 1000 should get you something
And a Z32 afm about 250 for a new one.
EDIT just remembered you will need Injectors of some description, i got some secondhand cost about 550 with cleaning and all or you can get yours hiflowed. And a new fuel pump 300, so say good bye to roughly another 1000.
Now your 3k is gone, make sure you give it a full service all oils and filters then take it for a full dynotune costs about 500 to 1000 depending who you go to and you should be able to make 220 to 280kw. Depending on turbo choice. Do your homework
Do you want more power down low or up top?
NB..do not think you can just add a turbo and drive it doesnt work that way..