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Couple things:
1) you can take apart your zl1 hats / rotors and mount to a z/28 CCB in the front. I've seen the rear swapped but I'm not sure how it was done. I don't believe z/28 disc is direct bolt on but you could try first. If i recall correctly the hats are off by a few mil but the disc width / diameter the same. Corvette has a different pattern I believe so I don't believe its a direct swap.
2) on track, I find the stock zl1 1le brakes better then the CCBs in terms of out right stopping power. However, the OE zl1 pads / discs overheat at about the 15 min mark. I can't recall ever cooking my z/28 CCBs and have run sessions of 40min+. I'm threshold braking and leaning the ABS looking for feet in the brake zones for reference.
3) The durability of track day driving leaves much to be desired with respect to the CCBs. Fast drivers can go through a set very quickly if long sessions are common. Pad wear rate and expense also much higher.
Personally, steel is the way to go if track is your focus. If your not tracking your car steel and CCB wear rates really shouldn't be an issue with the nod clearly going to the CCBs. If you are tracking your car regularly budget a significant reserve for pads and discs. For me: pads 3 - 4 days; 2.5 sets to a disc; max 12 days out of a disc. Pad wear rate worsens over the life of the disc and the stopping power drops substantially as the disc gases out.
Feel free to PM w/ questions. Not sure how folks have done the rears though but I've seen the Anderson composites car (I believe) w/ rear CCBs. Might as simple as a rear caliper swap but the z/28 calipers are also monster expensive iirc.
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