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I have a 65 barracuda with a 360. As of right now, I took the original 273 exhaust manifolds and ported them to the 360 exhaust ports. They flow alright, but you can definitely tell that my camshaft is slightly capped in power. Headers really are the way to go, especially if you have any...

There's no reason to have 3" unless you are pumping big horsepower. 2 1/2" is what I would do unless I had over 500 horse