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If you have the stock manifolds extrude honed they will flow nearly as well as headers. I did this on my stroker 273 and it worked well. Not totally sure about a 340-360 build.

My 1965 Barracuda has the 235 HP Commando engine, and I'm running stock exhaust manifolds with 2-1/4" pipes, no "X" or "H" pipes, & Flowmaster SS mufflers. It sounds great.