When i converted the brakes on my '36 in 1952 from mechanical to hydraulic I harvested everything from a '41 Ford, front spindles and drums/wheels. The master cylinder/peddle assembly proved to be a difficult issue, I ended up keeping the '36 peddle assembly putting the master cylinder where the battery had been utilizing a longer rod from the the peddle assembly to the master cylinder.
I had already relocated the battery into the trunk behind the seat on the passenger side, when I put dual exhaust on the car.
Within a couple of years the master cylinder location proved to be a problem, searching for a solution I found that a '39 peddle assembly was a perfect solution. With a few minor adjustments to the bolt pattern the '39 assembly solved the problem. Through out the years I have converted several cars, including my brothers '37 Ford 4dr. Many years ago I acquired a '39 peddle assembly that I have not used, it hangs from the rafters in my garage..