You can't really expect anyone to give you a diagnosis from a bunch of photos.

Send the head to a competent machine shop (Metric Motors), spend about $1000. for all the required parts and the testing to ensure the head is not cracked.

Then, you know that you've got.

Otherwise, it's just a crapshoot with a bunch of old parts that are not to specification.

I did it with the SD and it runs fabulous. Best money ever spent.