Ok. I am lost. I have a 71 cuda with a mild 440. 750 holley, mopar dual plane intake, 1 inch spacer, tti 1 7/8 headers with 3" exhaust, 484-282 pulple shaft cam, 3000 stall 727. I cannot get it lean enough at idle. It will pull 9.5in of vacuum in neutral, but drops to between 5-7 in gear. I have a 6.5 power valve. What can I do to get it leaner?? Oh, timing is at about 12 BTD. Thanks!!!