I have a Mercruiser 305 5.0l long block which was not winterized and unfortunately has a cracked block. Is there a market to sell this to? It still fired right up before I swapped it out. That was a $2000.00 mistake that'll never happen again.
Take out the rotating assembly and reuse it if its still good or sell it. Take the block to the scrap yard. You should be able to get enough for a case of beer.
Most places will build a short block for you for about $800 or so.
Im currently shopping around as I cracked my SBC 350 from improper winterization.