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Dang... Sound like I may have the same hard time at this problem with my car later, as it seems to have your exact problem.
Only thing I can still think of is fuel drainback from the carb, as I ~think~ the inlet is at the bottom of the float bowl and not all fuel filters have a "check valve" device in them.
I heard talk about this on the G-body list a while back.
Maybe a definite fix will show up pretty soon...
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-Rob Young 
1972 Cutlass Supreme Convertible (442 clone) -"Lady" (My mistress...)
http://www.flickr.com/photos/robsalbum/sets/
1986 Cutlass Supreme Coupe - "Pristine"
1978 Ford (Old Faithful) a.k.a. "the Tramp"
1997 Cadillac STS (for sale - too many cars!)
1999 Harley Davidson Sportster - "the Freedom Machine"
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