Different carbs on dual tunnel ram

Garrett Ellison said
In the AVS2 instructions I had, edelbrock recommended using a manual choke on one carburetor only and wiring (or mechanical fouling) the other choke open on dual carburetor setups. They have a pair of 1903 manual choke carburetors (500cfm) that come pre calibrated for a two four setup. When you get to where you are talking about going with a 4 inch crank and high lift cams with good heads, it’s time to graduate to a pair of sideways mounted 4150 Holley type carburetors, though.
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Edelbrock tech told me the 1903 carbs calibrated for dual quad applications, are suited more for low rise dual plane dual quad set ups, not tunnel rams, where the carbs will share a larger common plenum. For that application 1902 500's or 1905 650's were recommended.