Ok trying to install this last step to building my engine back up. I have the Ecotec Power book and it has a picture of where the sensor is supposed to be and calls it a NOTCH. There are two of these that are similiar to the picture. How do you tell which is the one to be lined up? Thanks in advance. Hopefully i'm not totally missing something here.

 

put the cyl 1 and cyl 4 at TDC. Meaning at the very top of the stroke up close to the head. And put hte little circle notch on the cam sensor at 4-5 O'clock inserted into the cam hex fitting.