I Have a 54 235 engine with a Rotttenchester B carb in my panel truck. I bought a replacement carb from O'reillys and it came with a larger fitting size in the air horn than the one I removed so my stock fuel line won't connect to the carb. I looked on line and can't find the correct size fitting to adapt the carb to the fuel line. I had an old brass fitting that fit the larger air horn bore and was able to determine that it is a straight and not pipe thread. I have two other carbs that have the same size fittings as my original carb but they are for 216 cu in and the bolt pattern for the mount is different size. Anyone heard of different size fuel fittings being used in Rochester B' carbs?