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One of the easiest ways to tell is if you have a cracked cam cover (seriously, not being sarchastic). There isn't much room between the gear, the chain, and the cover!
There are more scientific ways to do this that will get you # of degrees (I think 1 tooth=12 degrees, very bad) but with the valve covers off, and assuming that you dare to turn the engine (clockwise only), use the crank hub nut (a PITA from under the engine, I admit) to get the engine to the zero timing mark on the balancer. There are alignment marks cast in or scratched (I can't rememember) on the cams and front cam bearings that should be very, very close to lined up with each other with #1 TDC (that is, neither lobe is pushing down on the valves on cyl #1, the passenger side towards the front of the car). If they are way, way off, check the #1 TDC.
The top guides can't be removed without pulling the P/S pump on the left, and the alternator and its mount on the right, and then pulling the pins is not fun. But you should be able to see them.
Good luck, hope this didn't happen.
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