74 Dart Wiring Help Needed

The suspension I want to know if/where it can be adjusted or if I have to replace due to wear nothing is broke that I know of but this is all new to me I've known bout these systems mopar used but stayed away till I got enough knowledge and am now in the midst of working on this now that I'm confident in being effiecient enough to take this car on and this is the only things I need help with are wiring harness recommendations and advise on this bizarre suspension