Dual quad info

secondaries basically open at the same time as the entire front carb. Chances are that you aren't going to be running the car with the throttle 2/3rds to 7/8ths open except on your way to WOT. You're either driving along or the pedal is on the floor so the transition from 2/3rds open and WOT is momentary. Edelbrock sell a pairs of carbs for progressive dual quads. I know the primary is a 1903 and I think the secondary carb is 1904. If you go to Edelbrock's web site you can get to "Edelbrock Carburetor Installation Instructions" and there's a chart with the factory set up for every one of their carbs. OOPS the 1903 and 1904 are AVS. You want the Performer dual quad numbers which is their AFB carbs.