Couple things I would try -
When it quits, open the float bowls and see if you get the same amount of gas out of each.
As it's starting to run poorly, add choke to see if it has any affect.
Check the vacuum line to the petcock. Manually apply vacuum to the petcock with a vacuum pump.
Check the battery voltage - before cranking, during cranking, and running at idle and 3000 RPMs.
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