disc conversion on 76 c10 Brake Booster question

[UATahoe]

I will add one thing. Be forewarned that the fitting on the rear brake line coming out of the factory prop valve is a very odd size and basically impossible to adapt to something common. I am running in to this problem currently. The only option i have found is to cut off the old line nut, and reflare a new common size nut onto the line.