As long as you swap 1/2-ton for 1/2-ton, 3/4-ton for 3/4-ton etc. you are fine they bolt right in. Shocks bolt in also. Only mod will be routing of you brake flex hoses, some opt to reroute the hard line to the front like the 73-87 is or you can keep them as they are in the rear and get the proper length/ends flex hose. You will have to enlarge the hole on the frame bracket where the hard line and hose meet or turn the boss on the hose down if you have access to a lathe.
This is the smart way to go in my opinion. I did my 1 ton about 2 years ago and here is a link to what my experience was, not sure what your dealing with C10,20 or 30 but some of it may help you.
http://www.67-72chevytrucks.com/vboa...+1+ton+14+bolt