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The keyway on the crank isn't ground retarded, the keyway in the bottom sprocket is broached retarded. It really doesn't matter as you're damn lucky that nylon tooth OE set didn't shed teeth (yet). When you replace it with an early timing set you'll notice the dot on the tooth relative to the keyway is different (eliminating the retard). If you use a piston stop on #1 to determine actual TDC I think you'll see you jumped a tooth (in addition to an extremely worn retarded timing set).
 
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