Depends on your goals.
The Explorer has the MAF meter built into the stock air intake tube, for example, like a newer Ranger. Not quite as good looking as some of the Mustang parts, if you care about that sort of thing.
Your truck looks mean... I'll assume you will keep a 4wd trans/transfer case combo, rather than the Explorer AWD system?
This means littel ting like the check engine light being on, as the ECU will be looking for the Ex trans.
The Mustang harness is completely separate from any other truck system, so that is a bonus.
If you decide to use Mustang parts, you will need a distributor(TFI style), harness, ecu, MAP sensor, MAF meter if you use that syle (Speed density systems were also available in '86-'88) then you should have most everything elso already on the Ex (ECT, ACT, etc... lol)
This will show all the parts involved, it's the Motorsport harness, same as '93 stang.
http://www.fordfuelinjection.com/files/M-12071-C302.pdf