here is a bracket to mount the booster farther back.
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.
I think you can fit the hydrobooster in the original location. I fit both the master cylinder and hydrobooster on the original pedal bracket in my 48 2 ton. I have also installed a Roadranger transmission that is quite large, like 300 lb. I could go take a picture if anyone is interested.
Grigg
