Holler when you are ready to go to Bishops. Was just down there couple weeks ago.
Black Canyon is on Hwy 92, East end is off Hwy 50 past Gunnison. The West end you are coming from Hotchkiss or Crawford. Come down 133 from Carbondale, thats a good little road. 91 is a good little cutoff from 70 to Hwy 24.
I am headed out that way end of July most likely to do a 2 day loop to catch Douglas Pass; it's so far out of the way for me I plan to do some other roads like 65 along the edge of Grand Mesa, and Rim Rock in the Colorado National Monument park.
https://goo.gl/maps/NcnCpvanUxy