I think you may have answered your own question. TDC on the exhaust stroke is the same as TDC on the compression/firing stroke. The only thing that makes one different from the other is you or whom ever times the cam's.
The piston comes up twice during a complete cycle on intake, compression, power stroke, and exhaust.
If you can not find a TDC mark, put the piston as close as you can to top dead center. Rock the crank back and forth (by hand) and look all around the fly wheel and you will end up finding a mark on the flywheel and a dot or slash or cast line on the case it self and that would indicate TDC. Also note, sometimes you will have two marks on the flywheel, one for TDC and the other is ignition timing. When rotating the flywheel by hand in the direction of engine rotation, the first mark would be ignition and the next one that comes into play is the TDC mark.
Please note; The above is a general way of timing any over head cam shaft engine.
Ron
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