How much power through SN95 Mustang 8.8" rear (28 spline)?

well.... my dad's factory stock 5.0 broke one just by putting wider tires on it the other year so I'd say whatever a stock 5.0 and not much more

Seriously...that's not a good sign. No slicks or anything?

and hunt junkyards/swap meets. i got my a body one complete for 275 bucks just 2 years ago at a swap meet.

Dukeboy, you hit the lottery. :)