68 C10 6" rear drop issues

[Pzary3233]

I finished up the rear drop on my 68 LWB truck this weekend. I am not sure if I got the incorrect springs, or what. The rear end is sitting on the frame. From what I have gathered with a 6" drop the c-notch is not mandatory. However In my case it must be.




Older shot with the 7" 6 lug truck ralleys.

My suspension is as follows

CPP 4" springs - RCS603-4
Way2lo2's 2" lowering Blocks
CPP Deluxe Panhard Bar
CPP Shock Relocation Kit
Monroe Shocks.
15x10 with a 275/60/15

The truck is sitting perfect now, but I am afraid that even with a C-Notch the spring isn't going to be tall enough...

The odd thing is that the front end has the following parts and seems like it is actually a little higher....
CPP 2.5" Drop Spindles
CPP 3" Springs