Trying to sqeeze more out of my 340

I am running a 71 340 Duster drag car 2950 without me. 13-1 comp small 570 lift solid cam mild port X heads strip Dominator manifold 780ish carb 4.88 gears 29x12 slicks. It barely 60s in the 1.59 to 1.62s. 727 Coan 5200 convertor and runs 11.33-11.40 at 118 mph. I don't want to tear into motor but Im looking for some way to pick up 60 ft . Oh yah it traps at 7100-7200 rpm Back to the motor I had thought about moving to rpm airgap in hopes of picking up some bottom end or carb spacer on the Dominator. Any thoughts I would like to hit high ten with it if possible without opening motor.