WHich Header??
intrested fred i think, due to the reason, that you won´t get so much choices for headers for A-bodies (especially early ones) here in Germany, i decided to go on with an header-kit from Speedwaymotors. And weld them together on my own (with help from my mate who runs a HotRod-Shop)
http://www.speedwaymotors.com/Mopar-Header-Kits,3841.html
we will see how it works :-D (currently we are waiting for the parts to be delivered)