I didn't have them crack checked. They came off a running driving car so I believe they are fine. When I say milled I mean they were decked a lot. You can tell because the 289 on the bottom is shaved a little. They have manley guides that someone added.
As for the block I still have to pull it. When I pull it I can check all that stuff.
Here is my listing of the heads
Sorry if this link is not aloud
https://www.ebay.com/itm/265173640931