Technical 62 C10 Drop

So Im Looking To Drop My 62 C10. LWB
It Is Currently A Torsion Bar Front.
My Main Question Is How Low Can I Go In The Rear? Im Not Going To "C" notch It As Of Yet. Just Want A Decently Low Stance . An Im Also Going To Pull A Small 65 Camper With It. I Was Thinking 3 Or 4 In Rear But Not Sure If That Will Get Me To The White Wall.
Also At What Drop Will I Need To Get A Adjustable Pan Bar. Some Say @4+
When I Looked Under Truck Bed I Noticed The Pan Bar Mount Looks Like It Will Hit The Frame Brace Lower Then 4 .
Any Details An Pics Of Your Drops Would Be Appreciated. Thank You .

 

Why Does Every Word Need A Capital Letter?
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Pinky was working overtime

 

My 66 has leaf springs and I just flipped the axle. I think it was around a 5ish inch drop and I didn't do a notch. Yours sounds like the coil set up so I'm not sure about how the panhard bar will affect how low you can go. When pulling a trailer it did hit the bump stops a bit, but I have since swapped in an axle with a smaller housing and it's a lot better. Here is how low it sat with the added weight of the trailer on 275/60s

 

Just how my keyboard is set up.

 

Mines stock now. On 235s.
Just starting to fiqure my drop stance.