Not sure what "bulldog" means but my best guess is you're referring to the "Cali Lean"
Yes, if your truck is level then you would need some additional lift in the rear to make it level if you add spindles and shackles. The back will be 2 inches lower. You could do lift blocks, add a leaf, or an F150 leaf swap. The F150 leafs will lift the truck about 3-4 inches.
Here's my current setup.
4 inch spindles, 3 inch coils and shackles in the rear.
The back is about 3 inches lower than the front, sitting on 35's.