I deleted my abs, replaced all brake lines, and added a willwood prop valve on my truck. The valva says "disc brakes" on the package, but works ok with the valve turned all of the way down for the back brakes. Part of the reason for replacing all of the lines was so that I could use the correct fittings for all of my components, which means flaring your own ends etc.
It is a lot of work, but my brakes now work about as good as your typical 1980's model car. When stock, they worked about as well as a 1960's model car. Brakes are the biggest weak point on these trucks, I think.