I don't think it is the booster. If the pedal is dropping to the floor with booster assist, then isn't the booster working?
Depress the pedal gently as at a stop light and see if it slowly sinks. If it does then it's probably the MC or a leak.
Open up the old Master Cylinder and check for a damaged seal. (Remove triangle wire with plunger depressed with a Phillips screwdriver, release plunger gently to avoid it flying out.)
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1980 245 Canadian B21A with SU carb but electronic ignition and M46 trans in Brampton, Ont.
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