Not Ranked
Unless your Mfg. of Cobra designed it for a 460 and has headers for it, there is no such thing and can't be had anywhere. They will have to be custom made for your car. I wouldn't be too concerned to much about having them balance out on the flow bench,(i.e. equal length), you'll be happy to just to get built and installed.
Tim
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" It ain't no big deal" 
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