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1.5-2" spacer in front if 4wd, personally would not go higher than 2". Auto Spring sells kits for front and rear to choose from. rear you can go blocks or add-a-leaf the cheapest.
For the rear you can raise it 1.5” without changing shocks. You have the option of moving to a 3” block or add a leaf. I chose to add the leaf to help with load squat. I’m happy with my choice. https://www.stage3motorsports.com/13...-Leaf-Kit.html
Some guys choose blocks because there is less install time. I think the extra time is worth it.
I have the Bilstein Leveling Kit and love it. Absolutely no problems and it's completely adjustable. I have mine set on the highest setting, which is roughly 2.25". However, they also have settings for 0.75", 1.5" and 1.75" I believe. It rides great and I wouldn't change it for a strut spacer. As for blocks, I would recommend getting rear shocks that allow for up to 3 inches of lift, then getting a 2.5 inch block.