A 08flex Fuel 4.6 Dohc. In My 99 Gt, Ez?

ok I have a 99 mustang gt 5spd convertible with a bad motor, I was looking through listings and saw quite a few dohc's vin v the same price as the mustang engines vin x. These where mostly out of 08 and newer crown vics. They are flex fuel engines, and I was wondering how complicated the swap was? If there is a good thread somewhere I cant find it and any help would be awesome. Thanks
 
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Crown vics never got the DOHC....well other than the 2003-2004 Marauder.

I'd double check the listing again and make sure it's not an error. Only cars to get the 4.6L DOHC after 2004 was the Lincoln Aviator