OK there are two styles of covers that have essentially a matched pulley:

One cover has a single mark and multiple marks/notches on the pulley in 5 degree increments.

The other cover has the 5 degree increments on the cover and a single mark/notch on the pulley.

I've installed (because I wasn't paying attention) the cover and pulley with multiple marks; I ended up marking the TDC notch on the pulley with a dab of red paint. The plus side of this is I can not check the timing advance statically (matchbox dizzy) by rotating the shaft to full advance and lining up the 15 degree BTDC marks on the pulley and cover. I do double check with a light of course.

Tom