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Hello-
If you have the same size venturis and butterflies in each, then the difference in flow is negligible. Now, include the manifolds into the picture and you have _IDF_ winning, not IDA. IDA bore spacing is 120mm; IDF is 90mm. The intake port spacing of T4 is ~88mm, and T1 is ~50mm. So, IDFs will allow for better manifolds for both T1 and T4 than IDA. Plus, parts cost and availability of IDF is far better, AND they fit into engine bays a lot easier.
The only advantage (IMHO) of IDA is that you can bore them out to bigger than 48mm butterflies. If you don't plan to do this, then get IDF.
Take care,
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Shad Laws
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