There are angular alignment reference details with the timing belt process in the form of a little protrusion over the oil pump along with the matching notch cut out in the timing belt travel pulley’s rear flange. For no explicable explanation the timing marks / notch around the Blacktop engines https://4ageblacktopengineforsale27911.therainblog.com/31273418/considerations-to-know-about-blacktop-4age