2008 was last year of the regular cab 4x4. After that to get 4x4, you needed to get SuperCab (and 4.0 as 3.0 was removed from options, too). And most people who were paying for 4x4, we're afraid to spend a little more for the bigger cab anyways.
This should almost be a sticky:
To make a 4x2 torsion front suspension into a 4x4 IFS you need
Upper and lower A-arms (technically you just need the correct ball joints, but explaining what you need to parts guy is challenge, there are difference pre and post '08, so best to grab everything)
Knuckles, unit bearings and rotors
Half shafts and front axle
See footnote 1
Front and rear driveshafts for the wheelbase you are working on
Manual transfer case
See footnote 2
4x4 transmission
See footnote 3
Optional: lift blocks from 4x4 (and new u-bolts)
I don't know if shocks swap - they are a "wear" item and as the existing shocks were over 10 years old, I just replaced them.
Footnote 1: There is a bracket to mount the front axle that isn't present on the 4x2 frame. You will need to cut the bracket out of a 4x4 frame and weld into the Edge frame (slots have been in the 4x2 trucks which I have worked on, so accurate placement wasn't an issue
Footnote 2: If you really want electric transfer case, you would want dash and ECM and you want them to have exactly same options as your current truck - power windows, power locks, same engine, same transmission, same ABS, etc, etc
Footnote 3: It is possible to convert a 4x2 transmission to 4x4, but you need the output shaft and tail shaft from a 4x4 transmission. And removing the tail shaft requires serious transmission dis/re-assembly. You might as well start with correct parts. Exception: If transmission has different bellhousing, i.e. if you are building a 2.3 Duratech manual transmission 4x4, you would be in for transmission work as Ford never made that combination.