Just orded new headers from Layson

Maybe too late for the original poster in this thread, but it's good to think very carefully and do a good bit of research before you decide to spend money at Layson's. See, for just a few examples, here, here, here, here, here, here, here, here, here, here, here, here, and here. Much of what they sell -- including headers -- is not of their own manufacture; a large proportion of their product line is bought elsewhere and marked up. They're almost never the only source for a part; see here for a listing of some more reliable vendors for resto/repair parts.