while you got the timing cover off - you should do the chain and gears. You can get timing cover gasket kits that have all the gaskets you'll need including the front main seal. Be carefull taking the bolts out - don't use an impact. These things break really easy! I was replacing our water pump and broke two bolts, which required me to remove the timing cover to get out.
Before you put the bolts back in clean them good, and pick up some anti-seize, it'll help you if you ever have to take bolts out again.
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