I would like to know where to get the right size ford 9inch for the 87-93 mustang-length? how many inches and what cars had them?
What and where to put new brackets on the housing?
need any good info
What and where to put new brackets on the housing?
need any good info

The 8.8" is just very capable of handleing what your motor can dish out. You'll need new axles and probably a new diff. I read somewhere that the 8.8 us a smaller version of the nine without the removable front portion of the pumpkin. I say go out and get a detroit locker, gears and larger axles and then hit the track!