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Depends on which engine, it's not clear what car you have listed you are working on.
Yes there are marks on the cam indicating #1 at TDC, which match up with the crank TDC. BUT you have to realize on a 4 cycle engine the crank will show TDC twice for every once that the cam will be (crank rotates twice for every one revolution of the cam), so you can have the crank 360 degrees off when you check the cam. But in general you are correct. The best way is to get the cam mark at TDC exactly, then see how many degrees the crank is off, there is a spec for this, if it is out of spec the timing chain is either off one or more teeth (if it is WAY off), OR the timing chain is stretched (if it is off a smaller spec).
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