If there is an icon in the performance world, it has to be the Holley four-barrel carburetor. The beauty of the Holley is that from a plain-Jane 600-cfm to a 1,050-cfm Dominator, all Holley ...
There probably is not a mathematical formula complicated enough to calculate how many perfectly good Holley carbs have been tossed aside in favor of newer models, just because they needed a rebuild.