Rare 1967 Mr. Norm's 383 4 speed dart

OK, then...why did Chrysler make special exhaust manifolds for the 383 if existing ones worked?

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OK, I'll ask the question again...why did Chrysler make special exhaust manifolds for the 383 A body if existing ones worked?

The only manifolds available at the time (1967) would have been log style, no? Magnum ones came out in '68?