Haha well, I've been through 3 T5s in my car, so I was beyond due a beefier replacement. Some people can make then live, but apparently I'm not one of them.
Hopefully this TKO checks out. The seller turned out to be the founder and president of South Side Mustang club (fairly big deal in Indy) and he swears up and down that the TKO was behind a mild engine and was never driven hard. He was also willing to throw in everything I needed for the conversion, so I need to go back to get the drive shaft slip yoke.