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TFS intake
I guess that depends on how you plan to use the 347. From what I've seen in MM&FF and 5.0 mustang, people haven't had any problems making 400 hp with long-runner intakes like the TFS street. The track heat intake might make for lame low-end on the street, but that wouldn't matter if you were only racing with the motor. I think both will support 400 hp with the right heads, cam, etc.
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