Where to buy lowering kit?

[muddpile]

Does anyone sell a complete lowering kit to lower a 72 C10 with rear leaf springs? I was looking on Early Classics website, but all their kits are for coil trucks. They sell drop leaf springs, but I am looking at doing a flip kit to save some cash. Basically, I will end up with a 4/6 drop, or so I hope. Here's my questions in case I have to buy my lowering kit in pieces.
1. Who sells flip kits, what is included and are they hard to install?
2. Where does my lower shock mount move to when I flip the diff?
3. Do I need to re-locate the upper shock mounts? If so, how and where?
4. Do I need a C-Notch?
5. What would be involved with the front? 2 1/2" spindles, 1 1/2" springs?
6. How hard are the front end pieces to install?
7. 8" wide (I think) 15" Rally Wheels with 255/60/15 tires fit without rubbing?
8. Will there be any grief with my one piece driveshaft?
9. How well does exhaust fit over the axel?

All this will be going on a rolling chassis, so that makes it a lot easier. There is NO box, NO cab, NO front fenders/hood/grille. It is just a rolling chassis with a drivetrain in it. The truck will be used for work a bit, so I still want full hauling ability. The stock leafs look beefier than the ECE 4" drop leafs, so they should haul more I would think. Any answers or photos regarding my drop problem would be great! Thanks!