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St. Jude Donor '06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17-'18-'19-'20
NCM Sinkhole Donor
If you are using stock C5 tire sizes, they are going to be a bad fit. I made the same jump and my tires were one size up over stock in the rear (285). I have had a couple people point out that they look funny. The lip of the wheel sticks out more than the tire. So, the lip is much more vulnerable to rash than it would normally be.
St. Jude Donor '06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17-'18-'19-'20
NCM Sinkhole Donor
Your new wheels are Z06 sizes. GM recomended sizes are 265/40-17 front and 295/35-18 rear. You can easily go up 2 sizes if you want, but I would not go down from that.