Alisha,
Where in Indiana are you located? As stated by Tom wells, the best bet would be to take it to a Dyno equipped shop that has the ability to work on it also and is competent enough to tune it. There is a place here in Fort Wayne that is so equipped with a Mustang Dynomometer that can read up to 1750 HP and they have some very knowledgeable people there. The company name is EPP - Exotic Performance Plus. Here is the web site
http://www.exoticperformanceplus.com/. Check it out if you live close to Fort Wayne it's absolutely worth the trip.
John