I agree with both of you , woodruff keys are good but this was Fords way of getting around production tolerances i would use the tdc pin to set initially, but then as long as the cams are tightened with crank at TDC then it does not matter , so remove s/motor and tighten fully then set back against the pin and then tighten cam pulleys , if you were somewhere local would lend you the flywheel locking tools as I seemed to have gained some rather than using the trusty screw driver in the ring gear .