[71cadc10]

knock sensors, camshaft sensor, and crankshaft reluctor wheel are all not going to 'plug and play'
all can be handled, with various methods...but not a drop in deal.
The reluctor wheel, if the LS1 is apart...have a machine shop install a 58x wheel on the crank before you assemble the short block.
then you can bolt the front cover with it's cam sensor, and most external parts from the 4.8 engine onto the LS1.
knock sensors, you could drill / tap the sides of the LS1 block and install the 4.8 knock sensors to it.