Hard to brake

[Shane65]

My 72 needs way too much effort to stop the truck considering that it is power brakes. If I was to use the same pedal effort to stop any of the other vechicles that have power brakes I'd be locking up the brakes easily. I can't seem to get the brakes to lock up in a panic situation. I put a new m/c, porportiong valve and brake booster. With each part there has been no improvement. I don't feel I wasted money on these parts since they are replacing 32 year old stuff. All four pads have been replaced. I even took it to a brake shop for them to attempt something. They chargered me $180 to rebleed the brakes and set-up the brake pedal a little higher. No real change other then the brake pedal is higher. I intend to tow my car in an enclosed trailer but don't feel I should yet until the brakes are right. Any suggestions?