Here is a link to download the factory service and overhaul manuals.
http://67-72chevytrucks.com/vboard/s...d.php?t=558016
If you are new to this to the point of wanting advice for jackstand placement it would be a really good idea to find a buddy to walk you through the project. I've had good luck teaching people on one side and watching/helping them do the opposite side on both axles. It makes for a good, safe learning experience. Taking pictures before you disassemble after a good shot of brake clean is very helpful in any case.