Parts to lower C2o

[D-n-Tyke]

I will apologize upfront. I am sure this has been asked and answered many times but I can't find a good clear answer in my searches.

What parts are required to lower a '69 C20 suburban and where is the best place to get them? All the drop spindles I find say C10, will they fit the C20? What else would need to be change to use them? What about the front coil springs? I know rear can use block to get an inch or two rear drop. What if I want more, what rear coils are available?