My neighbor blew his head gasket. He wants me to change it for him.

Not sure if the block is damaged or not. Someone was kind enough to show me a link to a head removal tutorial. Anyone have any idea how long the job takes? The timing belt is over due a change so it will be done at the same time if I decide to take on the job.

Another question I would have is if anyone has any idea about shop cost to fix the head.

Do these blocks warp as well when the car is over heated?