First things first. Do you have a built bottom end. The type of power we are talking here will soon destroy you engine unless it has been fully prepped with good rods, forged pistons, updated oiling system, crank ring, good rod bolts, balncing etc etc.
There may be easier routes to take but here is a list of what I deemed necessary to make the type of power we are talking.
Bottom end.Reground and cryoed crank machine for a crank collar. Eagle forged rods with arp rod bolts. ACL race bearings. Forged pistons of a reputable brand. (oil squierter notched) The whole assembly balanced to within an inch of its life for high rev application. Modified sump, Gated and baffled, Jun oil pump. Tomei oil restrictors. Lightened flywheel. Tuffman harmonic balancer.
Cylinder head, major porting, Conversion to solid lifter valve train, stronger valve springs, New guides. arp head stud kit, steel head gasket. Hi lift solid cams and adjustable cam gears.
Fuel delivery. larger fuel pumps, dual feed fuel rail, fuel reg, 750cc injectors, Greddy Plenum, q45 throttle body, Garret 35/40 ex gate turbo.
Supporting mods. larger exhaust from the turbo back, (31/2 inch. larger intake pipe. q45 afm, Good quality gate and bov. Large front mount. external oil cooler. stronger timing belt. Cold air intake. Splitfire coil pak.
Then theres all the other shit. A new and stronger clutch will be an absolute necessity. the gear box will need an over haul and the first three gears will be strenthened at the same time. Little things like uni joints wheel bearings etc will have to be in first rate condition or failure is a given. An after market ecu is also on the list along with a boost controller.
Estimated power output will be in the upper 300 to early 400rwkw range.
Do your homework son. One of the first things that struck me when I started my skyline journey was the amount of young dudes who thought it was all about throwing on a bigger turbo and goin out to make hay. It doesnt work that way. For every action there is a reaction and in this case the reaction is a litany of broken parts hearts and busted wallets.
Go look in the classifieds, There is a brand new engine there built for this type of application going cheap for around 18,ooo bucks. That should give you some idea of whats required to do it properly.
To my way of thinking the best bang for buck is still the hiflow standard turbo with a good fuel pump, injectors and supporting mods. Lazy bastards car is such a machine and just impresses the sox off me with its performance for bucks. Runs mid 12's at the drags and pulls like a bull in springtime.
Your car, your money, do what you will, but just dont start without truly knowing how far down the tunnel the end really is.