I don't think there's evidence to say that a 3.6 or a 3.8 with a supercharger is going to be more reliable than a Hemi (what do you mean by 'reliable' ?). I think they're both pretty reliable from what I have seen (i.e., not leaving people stranded with a catastrophic engine failure). Biggest issue is overheating/cooling/AC from my own experience/people I have talked to that have swaps. You're right about emissions -- it will be difficult to pass in certain states such as Nevada and California where referees are involved, etc. My Hemi TJ (5.7, 5 speed auto) went through the emissions process in Nevada, and it was time consuming. However, the swap was done right and it passed without problem. California is trickier (and an LS swap will never pass). Have had no issues in Arizona but that should not come as a surprise. That said, saying that both are trash swaps is a bit of a dramatic statement (not even sure what that means, so I'm guessing). If done by a reputable shop at this point, you really should not run into any major issues, assuming you are sticking to the formula that's been repeated over and over -- including any tuning requirements. It did take quite a while though to get it right. Also, the harnesses have also had their foot print shrunk to the point where it's pretty much plug and play. Stray from that repeated formula and ALL bets are off. Also, cooling capacity is extremely important, and things like fender liners, grill modifications, winches blocking air inlet, and weight will creep up FAST. But yes, it requires more headaches, more money, and more time! If that means it is trash, then I guess many of us prefer the trash swaps For ~99% of people, the supercharger option is fine. The only real benefit you get from the swap is A) it's unique and B) sound (if you like the sound of a v8), and C) a different power band that feels more responsive. If I was building a buggy, I'd probably put in the cheapest reliable v8 I could source. Whether that be a Ford, Chevy, or Hemi. I personally don't care for the exhaust note on the Hemi engines though.