Do what I do and call 4Wheelparts and they will tell you what will and will not fit. GM finally stopped with the square wheel Wells on trucks and suvs which helps but it will all come down to offset.
If I recall my convo, was told the stock 20” on the Z would not be compatible with the offset I’d need to stuff a ton of rubber under there. The level and the 3.5” RC lift have the same max tire size FYI.
I decided to go for 35’s or 37’s so imma have to go new rims with the rough country 6”. Once I was told I’d need new rims for 35’s I said f it let’s go all in.