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Have the machine shop deck the head just so you have a completely flat, clean surface for the headgasket to mate to. When I built my SR I didn't touch the deck of the block but I had the head decked for good measure even though the motor had never been overheated too badly, with a 25 ish year old motor its just best to be safe IMO. Also, I just cleaned both surfaces very well and slapped the hg on with no issues. Tomei gaskets are the business. Also if you're stock 83mm bore get the 84mm hg and 1.2 thickness. Should get you close enough to stock after the head has been milled.
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