I have these heavy duty ( to say the least) 9" rear end housings. They are designed for race but can look just right under a show car as well.
They are designed for 1200hp.
For the complete package of housing, ends, and 2 axles....$700 plus shipping
If you want I will cut the housing to the dimension you request and weld the ends on (big, or small), and the spring perches for $900 plus shipping.
There are other things you can opt for, just let me know what you are looking for.
Bob