i believe your z28 killed the 350. i know my car is neck and neck with one, and a z28 will walk all over my car by many carlengths.
its going to take nitrous or a turbo kit to get the 350z to run with z28's or new mustangs. not sure what nissan was thinking...as its their flagship in this country. a v6 just doesn't seem like an engine that will be tuner friendly...as compared to an inline6 where its easier to setup for turbo...but hopefully i'm wrong in this assumption.
nice looking cars though, and i as i understand it they should contend with s2000's in their respective scca classes.