HD Rear end recommendation for a 1967 C10 w/Coil Springs

[wesmigletz]

I have a 67 C10 with a 12 bolt rear and coil spring suspension. I want a stronger rear end for regular driving duties, and some 11 second 1/4 mile passes. I prefer a bolt-in rear end, but will consider having one built.

What would be a good source for a donor rear end? Are there any bolt-in Dana 60s? What about modifying a late model rear end to work? In addition to having the coil spring brackets welded on, would they need to be narrowed, too?

A shop recommendation in the North Dallas area would be appreciated.

Thanks in advance.

Wes