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For more of a direct swap, you'll want a V10 from the 2000-2004 model year. The heads are different on the pre 2000 V10s.
Depends on what "blew up" on your engine. If the heads are good, you could swap them over to the 99 motor. Try doing a google search like this site:ford-trucks.com v10 interchangeability and there should be some good reading.
Just for reference, what exactly happened on your engine and how many miles?
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.