Re: power brake ?
You need all of the brackets on the firewall and the linkage all the way to where it attaches to the pedal.
I know on C/10 trucks the proportioning valve is different after 1970, and the master might be too. 1970 had front drums, later trucks have front discs.
On my 70, I kept my old master and proportioning valve and just pulled it forward and installed the booster/brackets/linkage behind it. Took some adjusting of the pedal rod and the brake light switch, but it works great now.
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