[Steeveedee]

Check out the Edelbrock site for making changes to your carburetor. When I bought my Edelbrock 600 CFM carb new it came with a DVD detailing how to set it up. In my case I had to richen the mixture a bit by going to smaller metering rods to get rid of an off idle stumble at low throttle volume. Consider that the trucks' setup may have variations in back pressure and cubic inches. Quadrajets are used over a wide range of engine sizes; there are many differences in their calibration as a result.