I had the same problem with my '68 ('74 q-jet) for years until I recently rebuilt it...and I mean to the point that I would get a small bottle and pour gas down the vent tube.
It can now sit for months and it takes no more than 8~10 seconds of cranking. This last build was the first time I decided to re-install the choke as well. I attributed at least some of the change to that.
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Greg Reid
Palmetto, Georgia
 
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