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several years ago, there were some poor quality carburetor float valves made with a very small hole for the fuel to pass thru. The car would run fine around town but get it on the highway and it would starve for fuel. When this would happen if you would let up on it for a little while it would get enough fuel to run for just a little more and then start starving again. I ran into this on a Model A of one of our club members. Took the carb apart and found a float valve with a very small hole in it. Replaced the valve, car then ran just fine.
If you have a good steady stream of fuel with the fuel line removed from the carburetor, you may want to check the float valve.
My experience, Chris W.