Couple things You got wrong:
-most guys doing the swap don't start with a wrecked truck or car. It is beneficial to start with a motor with all accessories, though.
-Rat just posted his huge difference in gas mileage with only a motor swap. No changes to the rest of his drivetrain.
-Aftermarket K does not mean better handling. Some might, but the best handling Mopars have factory K members.
The swap is bolt in with a LA K member, manual or borgeson steering, TTI mounts, and TTI headers.