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Maybe let's start with stock Z06 wheel sizes for a point of reference:
Front: 17x9.5 ET54
Rear: 18x10.5 ET58
Moving from 54mm offset to 30mm offset means the front wheels will be pushed out 24mm extra. They'll surely stick out from the fenders a good amount. You didn't mention anything about widebody so I don't think this will work.
The rears will likely be a similar story, being pushed outward by 8mm, plus having an extra 1.5" width. So compared to stock Z06, these wheels will stick out an extra 27mm (8mm + (1.5/2)")... that's a lot for a stock-width body.
For reference, I have 18x12.5 wheels with a 52mm offset on both front and rear. I run a lot of camber though (-3.5°F/-2.5°R).
I dont have a picture but OE C6 Z06 front wheels are 18x9.5 with a 40mm offset. Those fit fine on a C5 with about -2.7° camber.
These are the 18x12.5 with 315 tires. They are similar to the rear wheel specs as far as width and offset. If you put a wider tire on yours you will get more tread sticking past the fender. The wheels clear the inside fender fine so tubbing isnt going to solve anything. You would need flares to run those wheels.
MetalMan2 covered the poke in the front. On the rears, they'll poke by about an inch as well. Not ideal for stock fender or 2" wide fender, just right in between the two options.
My question is why are you going through the expense of tubbing the rear? The wheels you're asking about will clear the stock inner fender just fine. Tubbing is usually done when you're adding wheel width, but want it hidden under the car as opposed to poking out further...if that's your intention, you need to find wheels that accomplish that for you or tubbing is just money spent for no reason...
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