68 Barracuda 340 water pump , timing cover question ???

My 340 in my 68 Barracuda has the water pump with the drivers side outlet and the timing cover has the timing tab on the right side of the engine. I found the harmonic dampener has "ground" a groove in the timing tab (see picture) trying to figure out what will correct the problem but I'm not positive what's "correct" for my car?

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Auto trans or shifter car?