sound like a stuck float valve - remove the bowl (6 or so screws) and see
what's hanging it up. The hole you mention that faces air filter is the
atmospheric pressure equalizer port and is overflowing from non-stop flow of
gas past the stuck open valve (could be grit particle i valve tip or your
float is hanging up on something inside (bent tab, out of adjustment, etc.)
It's easier than you might think inside..
'63 TR4 since '74 - CT22326L with self-rebuilt carbs ..except the new shaft
bushes that Joe Curto, Inc. installed..
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