66' Barracuda and 273 with headers

66fs said

I would not bother with headers, let alone spend that amount of coin. 273's flow plenty of air it is just at a higher rpm. I never could bother with the hassle. What do you want to turn your car into?

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Unless you have a real hot rod 273 engine, headers won't get you more than 10-15 HP. 340 manifolds would be close if you must have performance. Most of the guys with 273's don't have headers. The ones that do run headers are running a 340/360/stroker.