You lol, 10 million different opinions on how to do it
Comes down to how much you wanna spend, setting up a high powered GTR for track duties is an expensive exercise if you want to do it with some sort of reliability.
If I were you,
Keep 2.6, Sort out the exhaust, standard Intercooler, standard cams, fuel pump with wiring upgrade, ID 1000/2000 injectors AND put -9s in it with cams gears dialed for response
That's for street duties and will net you 350ish rwkw.. Sh1t starts to break and get expensive from here on in
For track your gonna want a sump baffle, decent oil pump (oil restrictor depending on pump flow), oil cooler, catch can... If your going that far shit put a stroker in it with a new valve train.. See how it doesn't end?
Haven't even started on brakes and suspension when it comes to track.
BTW -10s are a no no on a 2.6