converting to disk brakes

[tripleblack]

I want to convert my front drums to disk brakes and i was looking at EC and CPP. I noticed that this is not that cheap of a job to be done. I was wondering if i could just go to a yard and pull a brake booster and master cylinder off of another GM truck, as well as the calipers, rotors, lines, and such. I plan on buying new 2.5" drop spindles so i wont look for those. Anyone have any suggestions for doing this another way than to buy new products? I was also wondering if my rear drums could be replaces also or if not could i use the new booster to power the rear drums? Thanks for the help.