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I am running a 1 7/8 to 2 inch step header on yates heads, and its plenty of header, 358ci, 660hp, 530ft pounds of torque. Regardless of engine size or builder, spend the money for the dyno and break in. That way, you know what you have. Any problems at that point will be the builders. As far as longevity, it will depend on the quality of the parts. Scott.
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