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P.S. AJ/FormS said: choppy cam and 15" vacuum are not usually found on the same engine.... I agree and am a little perplexed at what you have.

Probably wouldn't be different from the two sources. Both are below the throttle plates but, the OEM ran it off the intake plenum. I tend to go with that. Well, 15" at the source should cause you to bump your head against the steering wheel when you apply the brakes hard. Decelerating in gear...

You probably are correct that your engine vacuum is too low. BUT, I would confirm this by measuring vacuum at the booster with the car in Drive, foot on the brake. Where is your vacuum hose connected at the engine? BigBlockMopar suggests vacuum at the carb. base. I'm thinking of the usual...

Pull the hose at the booster and measure the vacuum. Or at least put your thumb over the end. 15" is pretty strong.

First, you could disconnect the hose to the booster and plug the intake side. See if there is any change in pedal effort. You did not state what the actual problem is. High pedal effort but, still stops o.k.? high pedal effort but, weak braking? long pedal stroke, short pedal stroke?

You are implying that your brakes need high pedal effort? The booster is not assisting in braking? I agree with the others here. 15" vacuum is plenty to operate the booster. Got 2 vehicles that are running 7" to 10" and the booster works just fine.