The Gen V 5.3 L83 engine has a lot of promise. With direct injection, high compression and CVVT we hope it will have the mid range torque a heavy JK requires. We are hesitant to recommend the Gen IV 5.3 in a heavy JK because the 6.0 does a much better job hauling the weight. The problem with the Gen IV 6.0 is it is not compliant in California and other areas so you are stuck with a 5.3 or 6.2.
The new 5.3 also runs on regular gas, uses synthetic 0/20 oil and holds 8 quarts of oil. Here Mitch and Joey start a almost new L83 on the stand.
I'd be curious to see the low to mid-range torque numbers compared to the other options available. Aside from availability and CARB compliance, do you foresee a larger cost savings to benefit this swap over the others? A dollar to HP/FtLb ratio between the options would be interesting as well, at least for the "Efficient" (read frugal) among us.