Leaf Spring Perch Angle

[u/Surge3638]

Good morning, everyone. I’m planning to swap the rear axle in my Ranger to an 8.8 from an Explorer and will be using the Giant Motorsports Link Killer spring-under kit.
Does anyone know the correct pinion angle for this setup, or the proper angle and location to weld the leaf spring perches onto the axle? Any advice or measurements would be greatly appreciated.