During my last carburetor rebuild I messed up and put a slight bend in the Step up rod on the original AFB 3922S Carburetor. I was able to straighten it but not perfect but works smoothly. I have the feeling the Rods need to be replace but do not know what came from the factory. The Rods are smooth with a taper, no steps. I been looking at rods on line and there are so many sizes I'm lost. Had this car since it was new in 65. The car runs fine with this rod seems OK but not certain in the long run.