You'll find angular alignment reference details for that timing belt technique in the form of a small protrusion about the oil pump along with the matching notch cut out of the timing belt drive pulley’s rear flange. For no explicable explanation the timing marks / notch about the Blacktop engines https://finnbcluk.bloggerswise.com/39324400/an-unbiased-view-of-toyota-4age-blacktop-engine-for-sale