That is a good idea, here are some comparable installs I have helped on or with the Explorer have done.
vehicle: 90 Ranger, reg cab, long box,2wd
engine: 95 Mustang 5.0L
mounts:95 Mustang factory, both RH sides
hedders: Hooker long tube
oil pan: Factory 95 Mustang
tranny: T-5, 90 Mustang
accessories: 95 Mustang factory
rad : custom (similiar to James Duff)
hedders are too close to frame for my liking. Plenty of rad clearance, enough to run a mechanical fan. Good placement and fit other wise.
vehicle: 84 Bronco II, 4x4
engine: 95 Mustang 5.0L
mounts: 95 Mustang factory, both RH sides
hedders: cast manifolds from 65 Mustang 289
oil pan: factory 95 Mustang
tranny: C-5 with V8 bellhousing
accessories: factory 95 Mustang
rad: 95 Explorer super cooling, V6, custom mounts
good all-round fit. Done on a super budget and cost more in the long run. So far he has blown his rear carrier twice and rear driveshaft once.
vehicle:93 Explorer 2wd, slammed
engine: 93 Mustang 5.0L
mounts: James Duff
hedders: Ford Motorsport 96 Explorer hedders
oil pan: factory 93 Mustang
tranny: 93 Mustang AOD
accessories: factory 93 Mustang
rad: James Duff
a few problems with this install. Intake won't work without major modifications to the heater box and A/C dryer. The longer accessories would not allow the factory rad to be installed into the rad support so a James Duff had to be ordered. Other than these problems the install worked very well.
From my own experience I would recommend an engine from a 94-95 Mustang or a 91-93 T-bird/Cougar. They are identical engines and H.O.'s. The oil pans work, the accessories are shorter allowing the factory rad and the intake has a 45 degree bend in it for more clearance at the heater box. These are all good things when it comes to installing a 5.0L into an Explorer.