Imho, you would be better off selling it as a core block.
Unless your going to buy pistons and machine it to those. Which would be silly.
Most machine shops are always looking for core blocks and cranks.
May just call around and tell them what you have. Might make a couple hundred bucks if it's not junk.
Take it for what it's worth.
I know I would be hesitant to purchase a machined block. The question is, machined to what?
GT