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One is limited in the number of times you can do this. This pass could certainly be allowed, but another like it at a later date would probably be too much.
It will raise the compression ratio somewhat and this is not a trivial matter with taking off that much.
One thing I was surprised by recently was on a '73 MBZ 230/4 head that I had done in the process of rebuilding the motor was the following. I sent the head to a place in LA that does only MBZ motors (Metric Motors). The head needed some welding to fill in some small cavitation around 3 water holes and I wanted it done by experts. Keep in mind that this motor has probably 300k miles on it and the head had been off at least twice before.
The people at Metric measured the head for flatness, then put the head in a press setup of some sort to flatten the head best as possible so as to minimize the material removal to achieve flatness in the final facing after welding. Now I don't know anything about how this is done, but apparently it does work. After they had finished the work I had them check the thickness against the original spec and the total material removal since new was 0.024 inch. I compensated for that by trimming the new pistons.
You might want to check out this matter of flattening in a press to see if it could be used to mitigate excess trimming.
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