Yes, because i've done it, the cheap way and the expensive way. All the cheap crap you see on ebay from America is the wrong spec. Good luck in getting good results with it.

The long engine is going to cost £2500-3000, depending on spec. Big power will require additional headwork. Then you've got turbo, manifolds, injectors, management, loom, mapping, dyno time, installation, intercoolers, fans, etc etc etc. It costs a fortune, just ask anyone on here who has actually done it.