Need 3/4 P0WER Brake information

[Simplysamoan]

I have a 1969 3/4 ton pick up and the brake pedal takes allot of effort
to try & stop the truck. Its got good pads on the disks up front and also the
rear drums. There is a CPP disk/drum proportion valve already installed.
There is no power booster behind the master cylinder. Will this booster help the pedal pressure when applying the brakes? If so I will need a bracket that mounts behind the booster to the firewall. I did see one bracket on a 60' moves the master & booster to one side so you can access the header on the driver side. Which booster do I use and will the stock clevis work with the same pedal. I noticed that some GM brake pedals have 2 holes in the brake arm.