Do all cranks have different keyways? My 454 has a cast GM crank and I thought I only saw one slot on the nose for a half-moon, and my bottom sprocket only has one dot and one slot for a keyway. Just wanting to make sure I'm not missing anything...thanks.

Some racing cranks have two keyways. Perhaps some stock cranks but I've never seen one. Some aftermarket timing sets have three or even nine slots for making different cam timing adjustments.