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FWIW most boosters officially need 14-15 in/hg but actually will work with a touch less... When I was younger & played with bigger cams I had a old 292/509 that when first installed almost ran the brakes but at idle they were a 50-50 deal.. With a little tuning mostly a little more timing the booster/brakes was fine....
The sellers 20 in/hg is BS, the stock magnum grind cam pulls 16-17 in/hg at idle...
That threaded nub is about 3/4" long. I've seen them threaded all the way in most of the time but a few times I've seen them with about 1/4" of the threaded shank exposed.
They can be adjusted to reduce the free play in the pedal but it can be tricky. If you adjust it to eliminate all of the slack, it may actually result on some preload. I made this mistake and it ended up putting my front brakes in a bind when the pads heated up. I had to pull the master cylinder and back that nub back in a little.