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An engine is basically an air pump. Your air pump can now flow about 20% more air because the outlet is less clogged. You can't run the tune designed for 20% less air.
It is difficult to drive because the throttle tables in the Edelbrock tune are left like they are in stock form - a small pedal input results in a large change in throttlebody opening. In stock form this is done so the car doesn't feel like a slug. When you have forced induction available this makes it very tough to keep the engine in vacuum.
Swap the headers or get a real tune ASAP.
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