340 Chugging instead of Reving

1969GTS340 said

Just tried this. Shut the fuel pump off while at the trouble rpm range. It continued to pop for 10 seconds and stalled

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And you’ve removed the air cleaner, got it running and brought up the rpm’s to the trouble range and eyeballed as best possible that there’s no excessive fuel dribbling, bubbling out dumping etc from the bowl vents, or etc?