Hi! New to this forum,wish I´d found it earlier. I´m installing aftermarket power brakes in my 1959 Monterey. It has a 312 engine with 2-barrel Ford carbureter. When it comes to connecting the vaccuum hose for the power booster I have two options: Using the same port in the back of the manifold as used for heater vaccuum valve, that is "A" in the photo, or a vaccuum port on the manifold in front of the carb, that is "B" in the photo. Which one is used on cars with factory power brakes?