Edelbrock springs 1406 and 1405

Have you considered an o2 gauge? I think it will speed up the process of tuning the carbs. It will help determine when it's lean or rich. As in idle , part throttle or wide open throttle. After some practice you will notice other clues such as how the engine sounds or feels that will tell you if the motor is lean or rich. Not saying you should ignor the sparkplugs.