2806830 BF block?

I’m going to pick up a slant core from Craigslist. I have read the identification chapter in Doug’s book, Dan’s ID stamping section and a bunch of his replies on multiple forums about casting and stamping numbers. I can’t seem to find anything a BF block anywhere. It appears to have the extra ribs as a BH would. Any insights? I will post better pictures and any stamping numbers I find when I pick it up this weekend.

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