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The motor in your Explorer is a SOHC(2V) Triton V8 so another copy of the same from any source(Explorer, F150, full size car, etc) will install relatively easily though you can expect to find some differences with accessories and wiring from vehicle to vehicle and year to year. Installing any other motor will be exponentially more complicated.
I looked at some triton v8's off an f150 and they seemed different and I don't see any triton marking on my engine. I'm just going to take it out of the truck and go to the junk yard. Thanks for the advice.
The Explorer is a smaller truck than the F150 so things like the intake manifold and all the accessory brackets will be different than what you find in the F series trucks. This is a physically large motor about the same outer dimensions as the big block 460 so everything on the motor has to be scaled down just to fit it under the hood and between the fenders of the Explorer. I believe Ford actually enlarged the Explorer engine bay when they made the change from the old pushrod 5.0 V8 to the modular 4.6.