What type of dyno are you looking for? Heres a place w/ a Mustang MD250-HD dyno. They aren't in New Orleans, they are in Baton Rouge @ 6225 Hollyfield Dr., Baton Rouge, LA 70809
http://www.tpsperformance.com
Heres one thats closer but I haven't found a website for them.
Shreve Automotive, 1341 Carrol St. Kenner, LA 70062
(504) 469-1323
This dyno locator might come in handy for you.
http://www.mustangdyne.com/newlocator.php?state=la&full=Louisiana