2 susp ?, 1 brake ? on 72 gmc c25

[292farmer]

ok tried looking for what i need didn't find it. i am looking to upgrade the front disc brakes, what kind of caliper am i looking for? i went to wilwoods site as i heard their good but couldn't make sense of all their specs. so does anyone have any recommends looking 75-90$ per caliper(if possible?).
also im looking to raise my truck for a prerunner look figured out the front(thanks 72mario) now to the rear looking for 5in out of rear with out sacrificing load ability.
was thinking of swapping trailing arms to top axle tube which looks like it will yield 6-7in lift, so how do i lower that 1-2in to get my 5in or are their hd lift coil springs for the rear? thank you everyone