My 58 3100 has stock drum brakes and master cylinder and no problem stopping. Just make sure all the lines (rubber and steel) along with the wheel cylinders and master cylinder are in good shape and you won't have any trouble. My truck has a 350 V-8 fuel injected with automatic overdrive. No problems stopping it.
Just be aware the brakes can fade if you drove through some water, and they don't get rid of heat as quickly as disc brakes will. But for normal driving, I'm not worried about the brakes.
