no, don't remove the engine, just the radiator and in my case , move the ac condenser out of the way
invest $16 for 1 month of Chilton online, but ignore the first step 'remove engine' lol
other notes: the oil pan does not have to be lowered, the oil pump stays put. alternator, ac compressor, water pump and front timing cover, including 2 bolts to the oil pan must be removed. The harmonic balancer is a tough one, it took a 700 ft. lbs impact gun to remove the bolt ( tty not reusable and a standard 3 jaw puller with short jaws to remove the balancer (it is keyed)
when timing cover is off, rotate crank until cam timing mark is lined up either straight up or down and place a witness mark on something non moveable. This is needed in that the crank sprocket timing mark is hidden behind the oil pump. cam is held in by 1 bolt, very tight . It is part of what they call the cmp actuator and is not reusable (tty)
rockers and pushrods removed, cam is spun to lift the lifters, 5/16" dowels to insure that they don't drop , timing chain tensioner has to have tension released, remove the phaser/cam sprocket and cam retaining plate and out pops the cam.
without moving the crank, line up cam with the pin at 3 o'clock , phaser/cam gear with the arrow pointing to witness mark and assemble with new actuator bolt (tty)
it's like any other ls cam change with a few twists.