Well for me ive always thought that SS Camaros were a little more buttoned-down and serious, so they called for darker tones and serious colors like black and Imperial Blue and such, also i always thought the Z/28 was a lot flashier, was a much more exotic kind of feeling so more exotic flashier colors were good for them like bright yellows, oranges, reds. Just my thought anyways =P
My suggestion? Id go with orange with white stripes, that way the orange fits the flashy Z/28 style, plus the orange and white matches the orange and white Z/28 emblem =D (haha im weird like that)...or maybe an inversion of it, white with orange stripes and orange interior but thats much more of a personal thing cause im an Indy resident and the 69' Pace Car was white with orange and orange interior, personally though i like the latter color better haha, and id hope they would have a few exclusive colors on the Z/28 that might be interesting to pick from