The FAA height waiver allows the park to build a structure as tall as 355 feet.
The new coaster is a relocated model designed by Anton Schwarzkopf.
One of the barges for "Harmonious" will begin testing on Epcot's World Showcase Lagoon very soon.
Iron Gwazi will be the world's fastest and steepest hybrid coaster when it opens in 2021.
With Joe Biden's win, the Donald Trump version of the show won't last much longer.
The ride will include two launches, the fastest hitting 70 mph in 2.4 seconds.
The coaster has been under construction in full view of guests for more than a year.
The 52-mph, 113-foot-tall coaster will be built by Idaho's own Rocky Mountain Construction.
Just a day after its track was completed, Iron Gwazi saw it first test runs ahead of its scheduled spring opening.