Interesting that the majority of cracks are between the IDI pre chambers and Intake valves.
More common to see cracks between cylinders or near the exhaust valves.
Guessing the head will be checked for straightness, coolant pressure tested , magnafluxed, plus valve seats and valves be re ground before you re install it?
Glad you were able to find a shop that could repair it. I bought a remanned Pontiac 455 that had a few cracks including valve seat areas on the passenger side head re welded and then remachined, ran great and never had any leaks or problems with it.