[Rick Parker]

Very common. Fuel in the rear bowl is forced out of the vent tube under braking and sloshes onto the secondary throttle plates creating an overly rich condition, causing the engine to stall. Get the white plastic vents (sometimes called "Whistles") that fit inside the float bowl and metering block. It's actually a relatively easy fix if you have the right parts. To test for this condition, fit a piece of 1/4"-3/8" diameter rubber hose and slip it over each vent tube forming an arch inside the air filter housing. Cut a small "V" in the hose to vent it and then drive the car. If the condition disappears, follow the above remidy and then remove the hose.
This "hose trick" used to be very common in Drag Racing circles because the cars "Left Hard".

Rick