You’re selling 30 over 340 block for $700 with rusty bores. I’ve bought std bore motors with less rust on one side of bore not all over. And it did not fully clean up with 30 overbore.... A seller could: hot tanked it, magnafluxed it, sonic tested, even rough bored that to make sure it rebuildable. Of course most people don’t. And if they do, they ask more money.