The generic reason to use the dual plane intake is exactly as you stated. Improved vacuum response at low rpm. Out does not matter how fuel is metered if the cylinders are not filling efficiently.
So yes, generally speaking, a carb and tbi act similarly. And both typically perform better on the low end with a dial plane intake. Port injection tolerates single planes far better as you are only metering and moving air.
Dave
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'68 Bird Vert, 455 , 6x-8, 1.5 HS, HEI, PPR TC-02-HF, TH400, 2500 Hughes, 2.56 8.2 (getting swapped for second gen with shorter gears)
Fishing guide in the Washington state for Salmon, Steelhead and Sturgeon. Fish-On!
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