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You need to rotate the engine to find the spot of least valve overlap. If you have high duration cams, this will be tougher. Use 5th gear and physically move the car.
The hissing won't necessarily go completely away. If you have a stethoscope, then you can pull off the end and "sniff around" for the leak. It will practically deafen you when you come across it. If you don't have a stethoscope, you can put your hand around all connections you can think of that shouldn't leak and listen for a change in the pitch of the hissing.
Don't forget to check down around the injector holes.
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