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Before you install the whistle... simply extend both (or all) the bowl vents with a length of rubber hose. Some even use a single hose connecting the front and rear bowl but leaving a segmet of hose cut away at the highest point to allow both bowl (or all 4 boals if dual quad) to breath.
This allows you to verify this is or is not the problem without dissasembly and minimal effort. The hose to use is 5/16 fuel line.
Something else which may be happening, especially on long duration, dual carb engines is the amount of vacuum being taken away at the point of braking to feed the vacuum brake booster actually goes to zero in the intake manifold, paricularly if you are not down shifting when braking "hard" (most really hard stops are "panic" stops in which there is no time or need to keep the rpms up.
The resulting loss of vacuum creates a rich condition and with no vacuum stalls the engine.
Hope this helps,
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michael
A man that is young in years, may be old in hours, if he have lost no time. But that happeneth rarely. Generally, youth is like the first cogitations, not so wise as the second. For there is a youth in thoughts, as well as in ages... Sir Francis Bacon (1561-1626)
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