I tried for 2 years to get rid of that off-idle bog and gave up in the end. The 750 eddy carbs are famous for it, try doing a search around other performance car forums. I tried every mod I read about and although I made some improvement I never did get rid of the bog completely. I bought a double pumper in the end. I've heard that the Thunder series AVS style carbs don't duffer with the same problem. They would still give you that stock look and an 850cfm is available..