273 cam & crank timing marks, confussed

I'm confussed about the timing mark alignment dots when installing a new cam. Should they be crank dot at 12 and cam dot at 6 or both at 12. Iam currently at 12 and 12 with # 1at TDC. The car runs but has no botttm power. If it should be 12 and 6 shouldn't I just be able to rotate the crank 360 and reinstall dist. at #1? Thanks for any help Mark