I believe that Mallory is a (YS621CV). My engine (1989 OMC Cobra Ford 2.3L) has the same distributor. Wish I knew how to help. Have you tried Marketplace on Facebook. My problem is locating where cylinder #1 plug wire goes on the cap. Firing order is 1342 but without a starting point for TDC on #1 it won't run properly. Any suggestions would help.Does anyone know where I can find a Mallory unilite distributor for a 89 2.3 ?