Since yours is a 94 you could go either way really. The 5.0 Explorer swaps work good on Rangers of same year because all the stuff like the rad,coolant tanks,fuse boxes,air box,a/c and other stuff is a direct swap between the two chassis.
I just put a 95 stang 5.0 in my 90 Bronco2 and its going pretty good making everything work. If you can get a good motor and harness for 500.00 I would jump on it. You can get a manual from Harwood Performance Engineering Home Page
to help you with wiring and other stuff. Its well worth the 25.00 if your serious about the swap.