My '53 with 235 and Stromberg BXVD-3 (originally a service replacement carb for the Rochester) does the same thing on E10 gas. It does better with ethanol-free gas, but I don't have any stations that carry it within about 20 miles of home (north of Dallas), so mostly running E10. Closest two for me are the Buc-Ee'S in Denton, off I35, and the one in Melissa, off US75.
I chalk it up to the higher evaporation rate of the E10. If I get annoyed enough (I guess I haven't yet), I will add an inline electric pump back by the tank.
Perhaps others more familiar than I with the Carter YFs may have some more specific thoughts.
