Ditto on what Ron said. The other mistake (in my opinion) that people make is using a double pumper on the street. I know everyone uses double pumpers, but unless you do a lot of racing, you are much better off with vacuum secondaries. For average street driving, throttle response is better, driveability is better and mpg (I know, who cares in a cobra) is also better.
Hey Whaler, I guess Ron and I just suggested that you need to change your carb