It really isn't worth the swap. It is more popular on the older cars because they are dirt cheap to begin with.
With your year car, you can sell it and buy a GT for only a couple grand out of pocket. Where as the swap might fall into the $4K-5K range.
It's a money issue, not that anyone has anything against making a stang go faster
-1998 Black Cobra, Kenne Bell 2.1L Supercharged
-2008 Shelby GT500, Premium, 5spd, Redfire, Mac Catback
-2007 Roush Nitemare Stage 3 Supercharged #48 of 100