Is my head junk?

[straight6chevyguy]

Chevy inline 6 head
Purchased this as a completely rebuilt head from a machine shop.
Had been sitting for a while and had some light rust or so I thought.
Guess I didn't look at it close enough.
Found a crack on a valve guide stem (not sure of the proper technical term)
And the pitting from the rust on the head face is worse then I thought.

Here is some pictures.
So is it junk?
Im sure probably it's obvious but I thought it would not hurt to ask anyway...