Are headers worth it for me?

Well I'm boring and am going to sandblast the manifolds and coat them with this grey manifold paint EXHAUST AND MANIFOLD COATING-hirschauto.com
I figure if I don't do performance I can at least make it look nice again. I know there are mixed feelings on headers in our crowd and I'm a boring, wait till I can do it exactly how I want person, so I inevitably was convinced to leave it alone till I can go the Doug's route. Thanks guys. Yeah dyno results on engines like mine make me wonder how much power I can make with just regular manifolds. Hot Rod had a 300 HP 360 dyno'd and even the 340 Hi Po manifolds didn't perform much better than the 318 manifolds. I'm sure with the higher HP applications the difference would be significant.