Good to clean out the threads in the block with a thread tap if you've got one. Surprising how cruddy they get.
Remember to make sure there is nothing (grease. oil, crud, gasket debris) in the bottom of the head bolt thread holes.
Then lube up the head bolts and washers with a bit of gear oil before fitting.
Re-torque (one at a time) after a few thousand k's when you adjust the tappets.
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