Hi Blue Cheese
I swapped my 5 something rear axle for a 1985 K5 Blazer (4.10's gears)...ditched the 1 ton rear springs for a pair of late 1990's Chevy truck rear leaf springs with hangers too...for the front end I ditched all the 1 ton stuff and got a 1/2 ton front axle, spindles, leaf springs, and hangers too...I then went to CPP and bought their disc brake kit with master cylinder too...
Took me about 6 months to get all that stuff done...
hope this helps you out...I have a build thread on here with lots of pictures in my photo bucket account...
Good luck with your project...
MikeC