You will find angular alignment reference details to the timing belt program in the shape of a little protrusion on the oil pump plus the matching notch cut out in the timing belt travel pulley’s rear flange. For no explicable motive the timing marks / notch about the Blacktop engines https://charlieqpnlk.mdkblog.com/37984340/top-guidelines-of-toyota-4age-blacktop-engine-for-sale