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the 2000 is a 24 valve correct? too much torque, it would twist the frame. I measured my explorer (gen1) once and an older 12 valve would work. 3" BL and relocating the radiator to the front outside of the core support and running an electric pusher fan and it would fit with out modifying the firewall, but it would still be tight and way heavy.
you would be better off to move the firewall back 5 or 6 inches to keep a decent balance and the 24 valve is possible but you are talking a heavy iron monster after all the frame bracing is done