One of the heads has this issue with a valve cover bolt hole. The hole had some epoxy in it and was threaded to kinda hold the valve cover bolt. The hole is wallowed out and goes through to the water jacket.

So, can this be repaired or is it even worth repairing and I look for different heads?

The valves are somewhat mushroomed I had to file them a bit to get them out. The valve guides have pretty sizable side load wear.