They do appear to be getting plenty of oil, but I am concerned about how close the intake pushrods are to the lifter bore wall with the offset lifter. That's got to be creating a bunch of side load on the lifter. On the 72 Dart I had previous I was running W2 heads with a solid roller cam, but the lifters I used had no offset. You may want to look into no offset lifters, as they will help get the pushrod away from the lifter bore wall and center up the load on the lifter itself.
