I have a 383 stroker with a Holley 750 cfm 0-3310-11 4160 Carb and have a slight "flat spot" right off idle (when nail throttle). The car is a 4spd and if you first take it up to ~+500 RPM off idle (1200 RPM) before you nail the gas it is smooth. Tried different squirter sizes (up and down) with no changes. Going to look into swapping out the accelerator pump cam and maybe a bit more timing. I was told that a Holley 670 Street Avenger would be ideal for my setup, but since my carb is basically new I would like to make what I have work. Any comments or ideas would be appreciated. Thanks.