Ok, I got the head off.

Draining the coolant was weird, nothing came out of the block drain, even pulling it right out. I could see into the block and it was dry, but the head and the upper part of the block was full. Plugged somewhere maybe?

The other thing I noticed was a crack between the cylinders at a couple of the bolt holes. I remember reading somewhere that this is common.

How catasrophic is this?

https://photos.app.goo.gl/79aKHKL5LB8E4uhLA

Thanks.