Engine ID help

I did a search and not finding what I'm looking for.
casting is. 11/17/69.
2780930-340-8

I have a couple of blocks to work with and it would be a waste to use this one for what I have in mind. This belongs in a car that is more along the lines of being stock. But I need to know exactly what it is to determine value. Its just the block,main caps and crank.