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Not familiar with those washer/slugs, but all Olds V8 engines in this era have the identical bolt patterns on the block. You don't need them on your application. Just install your Big block with either the original mounts and bolts or replace the mounts with new ones for a 350.
In general the only difference between a big block Olds and a small block Olds is that big blocks have about 1 inch more deck height (for the bigger stroke) and the cylinder heads are moved outboard and upward. Everything is the same dimensional (externally) from the timing cover down.
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