There's another thread on here for a 292 with a similar issue...good idle, but coughs & stumbles to stall upon acceleration.......It seems he's into valves & springs at this point....Most opinions I'm reading is a vacuum issue... In general an inline 6 cyl of early vintage is about as simple as you can get, so I'm having a difficult time realizing where all the vacuum failures can take place?....A running engine creates vacuum at idle....comes up through the intake, gets diverted into a port at the base of the carb, then follows its path throughout the carb....I'm 99.9 % confident I have no restriction in my carburetor, so I'm not understanding where this 'Sucking Chest Wound' of a leak would be??? Perhaps if I understand where the starting & ending point of this vacuum trail is, I can isolate my issue.....