Hi,
Instead of trying to "tune" a progressive system to work well, I used the Holley/Weber "Progressive" carbs. These carbs have a progressive linkage built into the carb so you can adjust when the secondaries open. My carbs run on all primaries until I floor it then all the secondaries open. If you want to save gas, you can disconnect the outer secondaries and not starve the outer cylinders!
RapRap
1940 ChoppedChevyCoupe
