So yes I used the highest setting in my 6.2L, if you have the heavier 3.0 you might be lower.
Originally I ordered the ready lift 1.75, but decided to get the Bilstein after. So I used the Bilstein and the ready lift UCA from the kit, it wasn't high enough so after I installed just the lower spacer from the ready lift kit with the Bilstein shocks.
So for the bolts I alternated, on the side with the CV I installed the bolt up (like the truck comes stock) and the other hole I installed down. That way I didn't need to worry about removing the CV to get that one bolt in on each side, didn't see any harm in just going up.
I also have the road active suspension on my '25 even though the company said it doesn't fit the newer 25 and up AT4s, it fit fine on my '25 and raised the rear about an inch. So that might be another option for you vs changing out the rear block to gain an inch or more.
Included a pic of the RAS installed and one of the spacer on the front, you can see the head of one bolt and then the threads and a nut on the other side.
View attachment 34025
View attachment 34026