cracked magnum heads

I posted the pictures to give others a chance to consider another option for a replacement head. I can take more pictures if you tell me what you want to see.
I went with these for this simple reason. They cost, shipped $579.00 plus tax. My machinist looked at my 185,000 mile heads and said on on one, there is at least 2 cracks. Guides are worn, seats are bad, valves are wore out. He did not charge me anything. Just told me, repair is iffy, and would cost more then they are worth.

Does anyone have an opinion on the seals, should I switch them or use what came on the heads?