1974 D300 360 fresh rebuild will not start

Northern Grit said
Yes the CAM can be at 6 or 12, but if the crank is timed at 6 then the cam will always be 90 degrees off (1/2 a crank stroke) and his compression when from 120 to 60 (about 1/2).

The ignition timing will be of 90 degrees but the cam timing will be on whether you time the cam at 6 and 12 or 12 and 12.