Worth a try...if it's inconclusive for you then you can pull the engine and check that way. One of the two possible TDC positions has the valves slightly overlapping, i.e. one is closing and then the other immediately opens. They should both be equally closed with the piston at TDC. If one is open more than the other, and/or you can tell it's opening too early or too late, then the cam is definitely off a tooth.
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