Rear End

[BIGPIMP]

i have a 64 c/c10 step and i have successfully changed the front over to disc .my question is the rear end . how hard is it to put a different rear end ,because the front parts are from a 1985 c/10 . i bought the spindles from a junk yard and tie rods and ball joint are from orielly's . i still have to get master cyclinder ,booster ,and proportion valve which i will get from the same 85 . will the 85 rear end fit without a lot of mods . think i will stay with manuel steering right now . no big problem there .