You might want to look into having the manifold repaired. A good welding shop should be able to weld up any crack in a cast iron manifold. I had the manifolds on my 394 repaired and one of them had a 5 inch crack in it. After driving it for years and years the weld is holding strong.
Or, if you just have to buy a new one you can check out the following website. They make reproductions of the W and Z manifolds.
http://www.themotorcompany.com/Manifolds-p-1-c-112.html
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"Some men are Baptists, others Catholics. My father was an OLDSMOBILE man." Ralphie Billingsley A Christmas Story 1983
"We rei-eign, supreme, ooooh god! Burrito supreme, and a chicken supreme, and a CUTLASS SUPREME!" Tenacious D 2007
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