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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Those may be press in's already
..in which you can hammer them out with a guide driver... and pop another in... the touch the valve job or the 45 at least.