Doing it by turning the crank clock-wise from the front, and watching the intake valve close, the piston will be on it's way up. When it reaches the tippy-top, it will be at TDC #1 compression. This is when the dizzy rotor needs to be pointed at wire tower #1 on the cap. The catch is, there is a period where the piston "freezes" before & after the crank is "straight up" between the main journal center and the piston pin. So the conn rod sees X amount of degrees of angularity change while the piston seems not to move. This is why You need to use the piston stop method to find the exact center of that small amount of crank rotation, so that Your timing marks read -0- when the rod and crank throw are in as near a perfect line between wrist-pin and main center.
