BY the way the Edelbrock carbs that are tuned for dual quads are set up to be used progressively, which can be great for in line 2x4 manifolds, but are really inappropriate for an STR-12 where the right carb sits over the ports for the left cylinders and the left Carb feeds the right cylinders. A progressive set up would mean that one side was rich and the other side was lean with poor air fuel atomization a lot of the time. A look at the inside of the manifold makes that situation clear.
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