I wouldn't rely on the crank pulley mark. Follow the coolant hard pipe that feeds your heater core, and the hole in the bell housing is right at the 90 degree turn to the passenger side, below your distributor like a4v8swap mentioned. At TDC, the 0 on the flywheel will be half-visible, the other half (dotted line in the picture above) will be hidden behind the 'step' located just to the right of the 0 in the picture.