There are kits available to convert a 14 bolt to disc brakes.
Look on E Bay under 14 bolt, there's tons of stuff on there for that conversion.
All it is are front rotors and calipers for a 73-87 K/20, and a custom made bracket to bolt the calipers to the axle tube.
Also if you want a woking E brake you can use calipers for a 76 Eldorado. They have the hookup for E brake cables on them.
