well it wont cost as much as you may be thinking...if you know how to do the swap i.e. know how to do the wiring harness, installing the engine, hooking up sensors, that such, it shouldnt be that much

you may have to fabricate some things in the 240 before that I-6 goes in though, i want to let you know i dont know to much but for a stock RB25DET 240 running it would probably be...

whole R33 front clip (RB25DET) - possibly in the 3000$ range including tranny, ignitor chip, sensors, wiring harness, turbo, turbo manifold, all that shit

240 shell - anywhere from 200$ to 1500$, depends on if you get a hatch or coupe, coupes will run you more because they mostly made those in automatic, 5spd is rare

your possibly looking at a 4000$ budget maybe more maybe less...once the engine is in and working then you can mod it, unless you want to build up the block and stuff its alot easier to put parts on the engine when its sitting on the hoist

i dont know much dont flame me if im wrong but i think im correct...i stick more to the SR20 just because its lighter, and can hold up to the 450 hp range on stock internals dont know much about the skyline engines