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on my base, which I am adding z06 brakes to, I added 19x9 and 20x11 forgestar cf5's and i believe the front offset is 56 and the rear is 72. It's worded oddly in my invoice, but that sounds about right to me. offset will depend on wheel size and width and other factorys, you'll likely want to have your wheel vendor/mfg provide clarity. I worked with paul @ need4speedmotorsports, he and forgestar hit the nail on the head for my fitment.
doesn't seem to be a ton of wheel size / offset information shared on the vette forums. there's entire databases committed to it on other car forums, with example photos of everything.. ha.