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Here's an article that highlights the changes yeay-to-year. http://www.edmunds.com/reviews/gener...6/article.html
Yes, you can bolt a 99 V6 into a 97 providing you are swapping an OHV for an OHV or a SOHC for a SOHC.
If you are swapping out an OHV for a SOHC, you will also require the computer for sure and not sure of anything else.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.