Sensors should be the same in most cases and install the same as original. I'm sure there's something I'm forgetting.

Knock sensors just screw out but I would buy new ones both for the proper application and because the torquing of them might make them not register properly.....plus the fact that truck LSX engines are bad about rust/scaling/corrosion of the sensors anyway.

There is a good torque spec for the knock sensors but I wouldn't worry about the pan that much. If you're starting with a bare block, the most important thing is the special tools to align the front and rear covers as well as the oil pan. You do that properly and it won't matter quite as much about the torque as long as you're close. On the other hand, there is no reason to not torque the pan properly.