Help with oil pan gasket.... Please?

The 340 oil pan changed in 1970. It used the style gasket set where the end seals had just the 2 stems at the very end to keep the seals in place on the pan when installing it. The holes in the pan were not the same size so that the seals were supposed to go on only one way. The end seals with all the stems are for the earlier 340's. If your motor is a early 340 with the later style pan on it then somewhere along the way it got changed. Some gasket sets are now coming with both style of end gaskets to cover both styles of pans.