AFAIK there are two different 3.5 L engines, one that faces forward with an external water pump and the the other a transverse (as in the Edge) with an external water pump.
As far as the 14 parts in a kit, you can check out this kit for what's included. Not recommending as it's not Motorcraft, and I'd only use Motorcraft, but gives you a good idea as to what's included.
https://www.partsgeek.com/4zlxl33-ford-edge-timing-chain-kit-and-water-pump.html
While you're tearing down the engine, I'd also go with new plugs, new coil skirts & new EGR.