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I can think of a person that would have a snit-fit over the flatness and finish
of the head serface. But I have never opened that Pandora's Box of hate and discontent.
Fairly basic machine tool and a set of feeler gauges. You could have one that would do the job for under #100.
Even as low as $50 if you search. Go used and they are even less.
The issue with machining heads is it isn't taking into consideration the block isn't being machined along with it.
Also, the head might be straight sitting on a bench, but warped as it is torqued down. That is why a REAL machine shop uses torque plates to simulate head bolts and torque patterns.