When i time these engine i do as follows.
1. Put crank at T| on flywheel
2. Pull spark plug and check that piston at TDC
3. Put in cam with lobes facing down(check plunger+spring)
4. Line up cam gear lines to head surface with 3rd line up
5. Adjust chain until its tight in front all slack to back
6. Install tensioner and check lines are perfectly lined up
7. Install valve cover with metal gasket and adjust valves
8. Turn engine over by hand atleast 5 or 6 revolutions to make sure you dont end up with a valve sticking through the piston.