That suspension system is much too wide for the AD series trucks. The tires will stick outside the fenders unless you either narrow the track width (fab intensive) or find some rims with severe back spacing to bring the rubber back underneath. Even then you will not be able to lower the truck height even to what the stock height was without either using lowering spindles or doing more extensive metal modifications. Some have done this modification and may be happy with the results but it you are trying to make a hotrod out of the truck this is not the easiest path to a good end result. It may look like it would work well and be easy to install but that is not always the best path.
Do some more research on the subject before you pull the trigger.
The best subframe for the AD series trucks in my opinion is the rear steer Nova or 1st gen camaro system followed by the G body system followed by the 2nd gen camaro system. Others include Pacer and Volarie (spelling?) systems.
The best suspension system for your truck would be an IFS kit. The initial cost is higher but the added value you get makes it work it. Plus they are engineered systems that work.
Don't cheap out on this part of the truck.
If you do not have to make the decision now I would put off doing the front suspension until you get some other aspects of the truck completed. By then you may have won the lottery and can put anything you want under the truck or you may have had time to think it through and see some trucks that have the different suspension systems installed. From that knowledge you can make a better choice for your truck.
Here is one link that deals with the 73-87 suspension on AD trucks.
https://www.stovebolt.com/ubbthread...s&topic=0&Search=true#Post361896
