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Not having worked on the Mopar or slant, I can,t say. I say easy, because you drop the oil pan, take off the valve cover (and head if necessary), disconnect a few hoses, and you can completely rebuild the engine WITHOUT removing it from the car.

I know, because Dad and I did exactly that one weekend. The car had been showing some evidence of oil smoke, so the wife and I drove home from LSU one Friday afternoon. Bright and early Saturday, Dad and I drained fluids, disconnected hoses, dropped oil pan and pulled the valve cover. At that point, we found that the oil smoke was due to the valve stem gaskets getting brittle. But....since we already had the engine completely apart, we decided to go ahead with a rebuild (rings, inserts, valves (and new gaskets).

The wife comes out, sees the car parts all over the garage and semi-panics ...."are you sure we will be back at LSU by Monday."

We drove home Sunday afternoon, as always (but without oil smoke).

I suspect the slant six would be similarly easy, having at least seen one of those in my roomies Plymouth Barracuda.