I suggest you buy an aircraft carrier and use the launch ram - that should get you a good 0-60 time and will probably cost less!!!!!
Seriously though, I've got a forged engine (being rebuild after the first one died on the dyno) water meth injection and hope to get close to the figures you're looking for.
Add to that another £10K in supporting mods and you get an idea of what its gonna cost - you can go faster cheaper!
So as others have said do plenty of research and be very sure it's a 350z you want to tune.
If it's not - I don't blame you!
If it is I wish you every success and look forwards to a build thread
O and to the forum.