You can get a block from a U or UC tractor or an M crawler. There is a guy who runs a lot of M crawler parts on ebay and he is from WA. Here is one of his auctions, you could contact him.
http://www.ebay.com/itm/Allis-Chalmers-Model-M-Tractor-Water-Manifold-UM-engine-/380156062029?pt=LH_DefaultDomain_0&hash=item588311294d
 

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