Let me do some checking on that. On my late 72 it seems like the washer with the tab(which I cut off) went on the inside of the timing side case. The reason to cut the tab off is to prevent it from breaking off and fouling the oil pump which means it would be on the inside of the case in order for that happen. You say you have another washer inside the case on the timing side? How much float does the cam have? Maybe someone with some recent experience can help out here. I'm going from memory when I built mine eight years ago. I will look at my Mick Hemmings DVD to see what he says. I wouldn't go any further until we get this straightened out. You might try posting just this question on the main forum which has a lot more viewers.