You did the easy part (the rear). Now you are going to have to get LAs, TB and HD TB bracket, springs, etc. Dont think you are going to lift it to 6 inches on ford springs. They just sit higher cause the load is higher. You put them next to a stock spring and they are actually shorter and they ride like steel bars (no suspension). Face it you are not going to "junk yard" your rig way up in the air other than~
Buying springs and building all the arms and such yourself
or tracking down a bunch of lucky deals on cheap parts
or the worst one is just welding and bolting stuff to your rig and having it ride like crap, no flex and parts failures.