When you're standing at the left fender, looking down at the pulley...
I bet the group of 3 is to the left, the group of 2 is to the right. In that case, it would be the group of 2 at the right. The pulley spins counterclockwise, and the group of 3 comes across the pointer first; they're before TDC.

I wish I knew WHY there's more than one mark for TDC. All of mine have only one.