JT engine timing

[CTDiesel at aol.com]

Can someone explain in greater detail about timing the cam and crank for the JT engines.  The Bentley states that line up the inner dot of the camshaft with the upper edge of the valve cover gasket and then split the "0" on the fly wheel on the diagonal section of the bell housing.  My though is that leaves quite a bit of mechanic error because i have it set that way but believe my valves are not closed fully. I think about one more tooth advance on the camshaft.  Does anyone have a more full proof method? 

Thanks
DJ