..used head

You want one with cooling holes instead of the slots -- I believe '81 and later are the good ones, so that one should be fine. Look for the casting date on the side of the head to confirm the year. You can also check here for some more good info:

Cylinder Head FAQ

Its really easy to find a good rebuildable core for cheap. I usually look for one off of an '84-87 E28 535i.
 
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