Try to find a good machine shop
and visit with the people that may be redoing the head for you. See if they are working on 4 valve/cyl types of heads. The last head work I had done was by an individual that came highly recommended and builds drag race engines for a living. You will have to be patient with folks like this but I have found it to be worth it.
Jim
'85 300D
'95 E320
'97 CRV
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