Please help me ID my frame

[Wilson_]

I am having some problems IDing my frame.
I have a 67 short bed step side
Disks up front and leafs in the back and it has all the stock rivets on the hangers and 5 lug all the way around.

I was told by a few people that the frame was a 73-87.
so i bought a c-notch kit for a 73-87 and the notch is straight, and my frame is curved.

So could some one ID my frame please?

Thanks In Advance!!!

Pics

Rear


Front Driver


Front Pass


Center


I have pics of the upper front if you guys need them.

Thanks again