I used a pedal and power brake booster/master cylinder from an S10 pickup for my '50 3600.
In my case the drivetrain was also changed so I needed a hydraulic clutch so I was not trying to adapt to the original clutch actuation mechanism.
I was able to leave the original dash brace in place and modify the S10 brace to adapt to the dash.
The clutch master was offset a fair amount from the original clutch pedal due to the master's location on the firewall being next to the brake booster. I modified the clutch pedal to be able to acuate the clutch master.
Depending on what your setup is I may be able to provide more insight but I need to admit that my truck is not road worthy yet so I have not actually driven it with this pedal setup.
