Here's the list I used to convert my dana 44 drums to chevy disc 10 years ago.. I got this from the So.Cal Bronco's website in their tech folder.Keep in mind this is a few year's old and prices may have changed.
Here's all the prices and part #'s These parts are all purchased from Auto Zone.
ALL PARTS ARE LIFETIME WARRANTY
#024196 0524 performance friction pads comp set $27.99
#095745 C503 RH disc brake caliper $12.99 +$10.00 core=$22.99
#095752 C502 LH disc brake caliper $12.99 +$10.00 core=$22.99
#048859 5492 brake rotor/hub comp. $30.99x2=$61.98
#788737 set 37 wheel bearing,Timken $13.99x2=$27.98
#788422 set 45 wheel bearing,Timken $13.99x2=$27.98
#704049 H5002 brake guide bolts $6.99x2=$13.98
#001799 313938 banjo bolts 7/16"x20x1 1/16 $1.99x2=$3.98
Total$209.86 without tax.Minus core charge of $20.00 new total=$189.86
I bought spindles and backing plates on craigslist.
Write up I used..
http://www.emotoman.com/disc/discbrake1.htm