starkweatherr,
I have actually seen adapters for sale that mount the hydrobooster on the frame and then run a long push rod back to it from the brake peddle. I did not think of doing it this way when I did my truck, but it is probably easier.
I'll see if I can find the link for the kit, but there is one out there for the AD trucks to use a hydrobooster.

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-