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The camshaft rotates at half engine speed and it does not matter which TDC you use when installing cams.
When people say the timings 180 degrees out that refers to the distributor in relation to the camshaft position. (I.E sparking at the TDC for the exhaust/inlet overlap point instead of the TDC for the start of the power stroke.
If the distributor drive is via an offset slot, and driven of the crankshaft, then you might have to swap the leads 180 degrees to get the spark at the right TDC
hope this helps
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