cruz, you need to take in to account the narrower width. yours are 9" w/ +30 offset. his are 8.5 w/ +35. He'd need an 11mm spacer to match yours (which probably means a 10mm since that is most common) up front and a 21mm spacer in back (again, a 20mm would be the more common).
jnslance, you need to think about what you want in terms off "flushness" In my opinion for a flush look the numbers for a 9.5" wide FR and 10.5 RR are somewhere around +22 FR and +12 RR. So if you are looking to match those numbers you could do a 25mm spacer up Front. and a 30mm in the RR.
Peruse this thread
[Official] 370z wheel fitment guide (pics/specs) only
Then use this calculator
Wheel Offset Calculator to figure out what spacer you are looking for.