Holley Carb/squirters+jets ?

Approx. 3200 lbs at the ready. Engine is a '69 383, stock bore and pistons, 906 heads (gasket matched only), 727 trans with 10" 3500 stall TCI super street fighter, full spool with 4.56 gears and 29.5" M/T slicks, Hooker Super Comps with 2" primaries and 3.5" collectors, MSD distrib and a 6AL box. I leave off idle @ 1500 rpm. The stumble is momentary, then picks-up well. Any suggestions? Thanks.