Hi Jase welcome to SAU nice 33 you've got there too
Just wondering what mods your car has currently has?
In my opinion building a 3L for 230-250kw is gunna cost decent money unless you're building the motor yourself of course. With a good tune, exhaust,intercooler & the usual supporting mods with say 3071 or 3076 or even a hypergear turbo your car will have good torque off boost and with the above mentioned turbos will achieve an easy 270kw on 98. P.S don't get a haltech