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RE: 289 body cars
The headers that typically fit a 289 car are of very poor design. There is not enough primary tube length to function correctly. When the 289 FIA Cobra was designed, header science was in its infancy, and the homologation design did not have a lot of thought put into it. They were what we now call "Block Huggers." They used 1.5" diameter 10" long tubes into a 3" collector that is approx 4" long, then into open 3" exhaust sidepipes. You have to create primary tube length before the collector in a very confined space to build & maintain torque. Check my gallery.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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