I'm looking for a 9" for my '65 Mustang. I found a '57 Ford 9" for $400 complete. Is this worth the money ? What else will I have to spend ? I know I'll want a new pumpkin with posi and lower gears, and will replace the wheel bearings as well. Anything I'm forgetting ? Should I keep looking for a less expensive one ? Thanks 
I will have to R&R it, so I'll have some $$$ in it by the time it goes in.