340 Edelbrock Carb Adjustment

stay with the edelbrock

the idle screws have nothing to do with anything but idle fuel metering

sounds like a needle or jet swap down a size or 2...buy a kit and drop it down until it doesnt do it anymore...a better indication would be to check the plug colour

I run a 625cfm on a 400hp 340...all a bigger carb is going to do is cost you more $