Brake booster recommendation

IIRC. mine needed over 13 inches idle vacuum. if you have an automatic, then in gear at 700rpm , I dont think that cam of yours is gonna make it.
Like I said; mine mightabin a dud.

But with an auto, as soon as you get the Rs up to where the vacuum starts "charging" the chamber, then you will have power assist. This can be as simple as blipping the throttle a couple of times before you put it into gear. Once moving, and with vacuum over 13 inches, then it will be fine until the next time you are stopped with your foot on the brake. If your stall is low, and idle is pulling, you may find the car begin to creep; no big deal with drum brakes, but with discs it can be annoying. My first step in making it better was the swapping out of the 33/32" bore MC for a 15/16". But in the end, I just got rid of the dual, in favor of a big single off an F-body.
I moved my washer reservoir long before any of this.

For you, time will tell; and it's a lil less of a problem with an automatic. Even less with self-energizing drum brakes.
Best of luck to you.