That looks like a standard '73 - '87 GM truck rally wheel. I've got a set on my '53. I don't know for sure but I'd think you could run a disk brake kit with those. They work great with the stock front end or a 4' drop.

http://i891.photobucket.com/albums/ac112/Twotone_photos/My%20truck/20161029154701_zpslqwhki4z.jpg