I'm not sure where you are getting your facts from but they are incorrect.
Quoted from Edmunds.com
Compared to the former 350Z, the Nissan 370Z offers a larger and more powerful 3.7-liter V6, a redesigned suspension with a shorter wheelbase, and upgraded interior design. Unlike Z progressions of the past, the 370Z is actually a bit smaller and lighter than the 350Z, making it faster, nimbler and more polished. There's even an actual glovebox and a more usable cargo area.
Nissan 370Z
Also, If you are serious about the Z... Take a deeper look through this site. There is a a lot of information already posted that would be of assistance to you.