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That line going to the valve cover breather seems like a great one for your brake booster. I would consider using that port under the carb for the brake booster and finding another place for crankcase ventilation...
I agree with seaves46 and ebear. Use a vacuum tree or vacuum T. If you have more than a mild cam, you might also consider a vacuum canister so vacuum is always available for the brakes.
ET... you jogged my memory... now that you say that it makes perfect sense... I usually use the oil pressure point down by the oil filter..
Smitty... I'm running a Quickflow 750DP... I know the vacuum advance line is in front but hadn''t looked for the pcv port there... lookin in the am.... thanks