I have read where Damon states that the quadrajet likes to be somewhere around 4-4.5 turns. My car(79 Z quadrajet carb) will not run at that setting. It has max vacuum around 17in at 10 turns. It is smooth, no black smoke and no fuel smell. What could be the issue or is there one? And will those screws stop when they are maxed out on turns or will they fall out?