Check ebay, and craigs list. After you aquire an engine, all the info that you need is here. http://www.stinger-performance.com/turboswaphowto.html A turbo motor out of an 86-87 thunderbird turbo coupe will fit as well as a svo mustang motor.
I have one I'm looking to sell but it's mostly torn down; I know I'll never get around to putting it back together. Located in Allentown, PA. turboford.org is a good spot to check also.
EDIT: Just checked your profile & see you're in Indiana so nevermind.
I'm also from Indiana, so greetings. Lol. What area are you from? Check your local junk yards and stuff. I know that there is a junk yard around 10th and raceway. The guy there is pretty friendly, I know for a fact that he has a 5.0 and t5 that he will sell (in package only with wiring harness and stuff) for $1350. But he told me that a while back. I think I remember seeing a turbo coupe sitting there too, not sure if the motor and everything was there as well. Hope this helps.
ah well hello a 5.0 swap would be fun but im really more interested in the 2.3T im also from the new castle area and we have mustangs just very few and there all ripped apart.