actually engine prices a non turbo vg30de is cheaper but swaping its gonna take more customizing and money.as far as mounting the engine custom exhaust and other stuff.your gonna need to know how to weld or some one who does.if i are serious and actually have money and welding connections id do a vh45de you can get the engine and wiring harness for a g.then youll need a z32 transmission.theres more for the swap at
http://www.mazworx.comand heres a youtube vid of a vg30de swapped 240sx
http://www.youtube.com/watch?v=pxLYy0OlyNk anyway search here some guys have done the vh45 and maybe able to help you better.plus if you were to do this youll have almost 300 hp without a turbo with a vh45de and 220ish with the vg30de.anyway have fun