Whoever you find, be absolutely sure they typically work on these aluminum M/B heads. You cannot use any old engine shop to do a M/B. It's almost a certainty that they will screw it up.

I went down that path with the 617 head and finally pulled the head out of the shop when it became clear that they had no clue as to what they were doing with it.

If you send it here...........you can be guaranteed a successful outcome:

Mercedes Rebuit Engines

Sure, it costs you about $140. in shipping. Consider it insurance against letting a moron work on your valuable head.