i have a 330hp. 350 gm crate motor (i bought the long block) and put a edelbrock performer air gap intake on it withe a 1 inch carb spacer and a 600cfm edelbrock preformer carb. my problem is that the motor is running rich at idle. i've adjusted the mixture screws to lean it out at idle but it still has a rich odor. i bought a 600cfm carb cause i thought that i could jet it up for power, never thought it would be to fat at idle? anyone got any suggestions.