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Alright, just found out some useful info:
If you put the #1 cylinder at TDC (line up the marks on the crankshaft pulley - see BGB under "setting base ignition timing"), no air will seep into the combustion chambers because all the intake valves will be closed. You can do this by the aforementioned way of pushing the car in 5th gear or you can just crank it a little bit at a time with the key. What I do is crank it until it's close to TDC then push the car a little bit to get it right on.
Another thing you can do is block off the line going from the throttle body to the valve cover - the other side of the PCV system. Disconnect the vacuum hose and plug the TB port. This way no air will be going through the crankcase at all and you should be able to pressurize the entire intake tract without anything hissing (except the leak you're looking for).
Hope this helps!
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