How to repair valve guide boss

Hi, I just came across this thread and I have a similar issue (as per photos).

So as plainly as you can explain it, what's the best way to repair these?

The guy rebuilding my engine was going to scrap my heads and use replacements, but I think my existing heads are a higher spec.

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Find a new machinist. It looks like it has a false guide in there already. Press it out, press a new one in there. It ain’t hard.