C20 Lowering and Balljoint Questions

[davidpearcy]

I have a 67 c20 with 8 lug wheels. I want to lower the front 2 1/2 inches. What are the differences between the ball joints for a 67 vs balljoints for a later model? I want to use drop spindles, but I am not sure which one to use for my project. From what I have read, the ball joints are different on the later models.

[CPPAaron]

63-70 trucks are the same ball joints.