It may sound like heresy to many Pontiac enthusiasts, but in my opinion Ford did a better job with the progressive linkage than GM.
Take a look at the factory linkage on the old Ford FE tripowers. The center carb is the control, with slotted rods from the center to each of the ends.
This differs from the Pontiac linkage where again the center is the control, but only one slotted rod to the rear, and then a fixed front-to-rear rod.
The Ford engineers found that by staggering the opening of the front and rear carbs (by 5 degrees if memory is working), there was less of a shock to the system, and less problems with hesitation when the secondary carbs were opened.
Making each slotted rod adjustable would be useful.
Jon.
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"Good carburetion is fuelish hot air". 
"The most expensive carburetor is the wrong one given to you by your neighbor".
If you truly believe that "one size fits all" try walking a mile in your spouse's shoes!
Owner of The Carburetor Shop, LLC (of Missouri).
Current caretaker of the remains of Stromberg Caburetor, and custodian of the existing Carter and Kingston carburetor drawings.
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