Spun dampener

Reversed rotation engines were mainly used when there are 2 engines side by side in a boat. One of them would be running reversed.

Regular Mopar engines came with left or right entry waterpumps. This put the timing mark on either the pass. or driverside of the engine.

I'd want to say you just need a different timingchain cover with the tab on the other side.
Or, if that indeed will interfere with the WP, just mark a new TDC-line on the balancer ring AND it's inner hub, so you can always check if it has moved.