Poly timing right out the 60 manual. They dont even mention TDC as its a given with the keyway. They say to line up the gears within the unmounted chain DOT TO DOT and then rotate (as a set) the lower cog to line up with the keyway (top cog be damned!) and then rotate the CAM to match the keyway in the upper cog and bolt her up. Let it land where it may but if you rotate the crank now to dot up, the cam cog will be dot straight down, or DOT straight up but either is gonna be correct, Dot to Dot is easier to visualize.