[Oldsguy]

John,
I think the vacuum would be the same even if you draw from a different physical location. Total manifold vacuum is the same at the bottom of the carb, the front runner of the manifold, or the rear runner of a manifold. When moving the location where you take vacuum for the brake booster you might have overlooked a leak when you plugged the spot you previously took it from. You could check for that for sure. You might look at the throttle bushing on the carburetor as suspect. If the bushings are worn you could get a vacuum leak. I think it might be a good time for you to buy yourself a vacuum gauge. Hook it up to the manifold and monitor what happens to it when you put the car in gear. You should have about 15 pounds of vacuum in park at idle with that rpm camshaft. I think they advertise close to stock vacuum with it don't they? Just a couple of thoughts anyway.....