The new set up looks good! Should be a monster,(again) I think my S475 on my Datsun spooled just as bad as your S480. Because I only had a 4.8L in mine. Haha.
Little update on the coupe... Took it out to the track on the GT42, Managed to get a best of 6.7 @ 105mph 1.4 60ft. it was at roughly 14psi of boost, with some 110 leaded gas. I feel like it should be faster then that, just in comparing it to the Z. But it was only my first time out with the new turbo so there is plenty of room for improvement.