440 tunnel ram

Or, you could sell both pairs of carbs and put that money towards two real carbs.

The vacuum secondary carbs are just not worth the effort, as most likely you'll never get the secondaries all the way open with the lightest spring in the vacuum cans.

The 4224 carb is designed and calibrated for 1970's junk. They are worth lists of money to the vintage crowd. They are essentially useless today. They weren't much better back then. Find a sucker for old stuff and stick those up his but for big money. Hell, Holley doesn't even make those any more.

For all the mental masturbation over the carbs you have, you could be done now.