Look in the projects forum. A guy was doing it but stopped posting about a year ago due to the negativity. Last I heard, the car was for sale a couple weeks ago. IMO, why buy a mopar if you're just going to throw a Chevy engine in it? I get you want to road race and have certain demands, but a Hemi can meet all those same demands. Uhcoog1 has a 6.1L in his Duster and has passed multiple modern sport/supercars on a road course. I will admit that the LS is a good engine and they're plentiful, but they're so overdone. Everyone tells me to do it for my Dart whenever I talk about replacing my 273 and they bore me to death. IMO, don't take what may be the "easier" route just because it seems cheaper on paper. You may end up needing to do quite a bit of extra fab work to make that fit, and a Hemi swap already has a lot of fab work. Remember, no one makes LS to Mopar A-body swaps. As far as which is the better engine, just from doing some quick reading on a bunch of other forums, the only major advantage an LS has over a GIII Hemi is cost. Everything else they're either quite even or the Hemi is triumphant. At the end of the day, it's your car. Do as you please. Why should anything I say matter in your decision?
