Disk brakes and lower kit help

[Mikes66ChevyC10]

So I'm going to do a disk brake conversion front and rear on my 66 C10 and I think I've found the front disk brake kit I'm going to use from POL (see link below). The kit comes with 1973-87 ball joints and tie rod ends. Will I have to change anything else in the steering to make the this setup work? Would it be better to to buy a disk brake kit with out the 73-87 stuff and just stick with the stock 66 style ball joints and tie rods?

I'm also going with the 2.5 drop spindles and 3 inch lowering springs. Will I need a shock relocation kit? Can anyone recommend a good kit? For the rear I'm planning to lower it 6 inches. What would be the best way to achieve this? Would it be good to go with 6 inch lowering springs or 4 or 5 inch lowering springs and then blocks? Will I need to notch the frame? I'm will not be hauling anything in the bed.

thanks in advance for the help!

http://www.ebay.com/itm/151663021001...%3AMEBIDX%3AIT