273 cam & crank timing marks, confussed

Finally some straight non confussing answers with the 12 and 12 method which is what I thought was correct. Thanks guys. Now for the 273, I think it is history by way of a 360 I have if i could only identify the cam #940162. I remember it put out alot of fumes when it was in my former challenger, so I suspect it has a good bit of duration to it. Thanks for any info