I wouldn’t run the low setup, you can get the truck low enough with the standard setup. Also, know going in, the ride will be very firm, harsh even- on rough roads(see below).
Depending on how low you go, you may need adjustable upper ball joints. SPC makes some. I don’t run them, and I have around 2° of negative camber up front. I don’t mind it, I just keep tires rotated more often. The added camber helps with turn in when I take the truck to the twisties
The rear drop is limited by the lower control arms and the clearance to the frame, anything over 3” and you’ll have an extra bump stop with big bumps.
Les just recently upgraded the springs to QA1, 650lb fronts and 550lb rears, and said the ride is much better. The springs that come with the Coilovers are north of 1200lbs. He has a thread about the recent swap.
I bought a set of new springs as well, I just haven’t had the chance to install. I went 575lb front and 500lb rear since my truck is a bit lighter than a 4x4/Awd