I've done it but ways and like everyone else had mixed results. Years ago I heard of someone using a MOPAR neoprene rear seal but I think it took some machine work before the engine was assembled. I have had good luck with Best Gaskets and their method. When doing it from under the vehicle I loosen the mains to take the load off of the top half and I leave the stick-out on the lower half because it is hard to trim the upper. I have gone as far as taking the timing cover loose and sliding the tranny back to gain more room on top. I think it comes down to whether you want to try to fix it or whether you want to redo it.
