That's who made the kit I was trying to find.
http://www.abspowerbrake.com/4754chevytruck.html
near the bottom.
Should be simple enough, and you don't need the pedal assembly they offer, as you can use your old one.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-