You might want to consider a reman hydrovac. I last went looking for one about 10 years ago but they may still be available. I think I paid about $175 for it.I have seen kits for them advertised recently but I don't remember where.
Looking at the spec sheets, the hydrovac provides 63% of the braking force at 1,000 psi. I put a hydrovac on my 1-ton and have been very glad I did. Before, more than once I had both feet on the brake pedal. On the upside, I ran over 100,000 miles between brake jobs. Now they wear faster.
