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Hi guys, I have a 318 Mopar with Crower cam http://www.crower.com/camshafts/mopar-273-360-la-pro-street-solid-cam-278-fdp.html, 9:1 cr, 650 mec carb, Weiand X-cel intake, ported heads with stock valve sizes, 4 speed. I'm choosing between the Headman tight tube or Dougs D453-R headers, long...