Schurkey - I'm not sure of the make of the master cylinder. I assume it's a reproduction - I purchased it from Firebird Central, and they don't state the manufacturer.
Steve25 - with the old master cylinder, the brake pedal went near to the floor when applied, and braking power was almost non existent.
i82much - the holes are the ones that you have highlighted in yellow.
As to everyone, thanks very much for your input. It sounds like my issue is the booster and not the MC, though the holes that are highlighted in yellow as shown in i82much's picture of a MC are, I believe, like the ones that I covered with my finger tips, and which when I did so stopped the hissing sound.
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