Here is the kit I used to level mine.
https://www.roughcountry.com/gm-susp...kit-8596c.html
It rides like stock. I did NOT install the rear lift blocks. I installed all 4 shocks and the upper control arms. Generally shock length is part of the ride problem along with the upper control "topping" out.
Tires are 285/75r16
Here are more pictures.