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Are you looking for tube headers or cast iron? Tube headers would have to be custom made. Cast headers werent ever made, but splitting the stock manifold is pretty do-able. Better yet, a split manifold using a truck man and car man will create something like fentons.
Mike Yoder at Kansas Kustoms will make this for you. Look at the
inliners (www.inliners.org) website, I think under 'vendors' and you will find his page there. I have some pix of 226 split manifolds that he has made, if you would like, you can email me.
Contact Red's Headers www.reds-headers.com They don't specifically list your app but are flathead specialists. Another good one might be www.headersbyed.com If you are totaly frustrated, send me a gasket and I will laser-cut you a flange.