Sometimes getting rid of the stumble on the AFB is a PIA. Between the different accelerator pumps and the position of the rod that goes into the arm for the pump shot, you should be able to get it. What a lot of people miss is the readjustment of the height on the plungers side that needs to be re adjusted.
Don’t let anyone tell you that the rod should be or has to be in the hole closest to the carb. While that delivers the most fuel into the pump shot possible, it can also be to much.
The carb size won’t add rpm to the engine. If the power stops pulling at your 5800 rpm, it is the cam that is running out of steam or valve float. Your cam is small and perfect for a driver. One other thing, your tires are large in diameter for getting off the line quick and easy.
