SC? Sorry not with it? haha and rear mounted turbo, I hope you don't mean back of the car? lol
SC = Supercharger
Rear mount Turbo = yes at the back.
Both running together = no friggin lag whatsoever. The rear mounted turbo will suffer less from heat soak.
I think its the STS rear mount, and then mount a shocking great SC at the front.
Of course you'd have to forge again, but you'd be seeing 500+ and a beautiful amount of torque.
STS discussion
http://my350z.com/forum/forced-induction/293025-official-sts-rear-mount-turbo-discussion-thread.html
And here's a LS2 TT rear mounted monster!!