I rebuilt a 1963 ford 2100 2 barrel carburetor out of a truck with manual choke. I put it on and it has a bad idle and dies requiring the choke to start it again. Thought it was a vacumn leak but sprayed WD-40 with no change in idle. So I took it off and put the previous carburetor with the electric choke on it and the idle is great so I thought it is not a spacer intake leak. What could be wrong? I have it on a 272 Y-block 1960 ford manual tranny. Appreciate any help.
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