So they weren’t lying…

You can also post numbers on this thread. I'm going to call the block as a 341 Desoto "S26" by looking and the other parts. 392's are massive, and I think you only have the 392 heads. The rest of the parts look like Desoto parts. A 354 is a highly sought after engine as well as the 1556157 heads. Good luck.
Looks like you’re right about the bare block. That said, the crank I have is a 1619647 which is listed as a 354 crank

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