With 33s, the single best thing you can do to get more torque is upgrade the axle gearing, to 4.11s or 4.53 (I think those are the 2 common sizes), if you haven't already.
If you're doing that, you might need a new rear carrier for the back to accomidate the jump over 3.55. Because 33" tires are the point where the (shitty) Dana 35 gets weak.
So it might be worth it to just get a Ford 8.8 (or even better a Ford 9") or a Dana 44 if you can find it. Junk yard parts are always better and cheaper if you can find someone do do proper welding insted of a shop.
Alternitavely you might just want to get a Super 35 kit, which comes with stronger axleshafts, and a rear locker (ARB manual or Detroit automatic, both strong) which might be cheaper, but will be easier to install, and you'll get a locker out of it. This is what I'm probibly going to do when I get 33s.
Yea, I've got a 4" lift and I'm on 30s. (In my defense, it gets a bit more articulation, but I'd rather have 33s.)
MORE makes a conversion kit for the TJ to put in a Hemi, but the inline 6 is a nice engine, lots of low rpm torque.
Alright, but the Hemi is lighter and has more output (torque and power) than the small block AND has better milage. (but is way more expensive) Lots of people put a 350 or 5.0L in jeeps tho.