sounds like you're vapor locking. ie - the fuel in the line is getting too warm and boiling off before it gets to the carb resulting in interruptions to fuel flow.
check all of your fuel line routing and make certain that it's well away from all exhaust components. use thick rubber hose in the top of the engine compartment.
you might try putting a wooden or plastic spacer under the carb, that blocks most of the heat conduction into fuel bowl from the intake manifold..
you might also try leaving the hood up or open if you're only going to park for a short time. that will help dump heat from the engine compartment.
The way to crush the bourgeoisie is to grind them between the millstones of taxation and inflation.
Vladimir Lenin
Government schooling is about "the perfect organization of the hive."
H.H. Goddard, Human Efficiency (1920)
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